DEV Community: Cryolab Global

Cryolab Founder Has Attended Every ESHRE Since 1985 (42 Years)

Cryolab Global — Thu, 02 Jul 2026 12:42:01 +0000

In 1985, ESHRE held its first meeting in Bonn, Germany. Paul Hague, now founder of Cryolab, was present at that inaugural event.

Since then, he has attended every single ESHRE Annual Meeting without exception — marking 42 consecutive years in 2026.

Early IVF context
IVF was in its early clinical stage
Laboratory protocols were not standardised
Cryopreservation techniques were still developing
Equipment was often adapted from other scientific fields
Paul Hague’s industry journey

Paul Hague worked as Export Sales Manager at Planer during the early years of ESHRE. His continuous attendance allowed him to observe the evolution of reproductive science first-hand.

Over time, this experience contributed to the founding of Cryolab in the early 2000s.

Cryolab today

Cryolab develops and supplies equipment used in IVF and reproductive laboratories, including:

CryoStork dry shippers
CryoNest cryogenic storage systems
Spermscope cell analysis technology

Visit us today

Specifying Half Canes and Half Cryosleeves: A Technical Guide for IVF Labs

Cryolab Global — Fri, 26 Jun 2026 13:08:54 +0000

Half size cryogenic canes and their corresponding PVC cryosleeves are a small but operationally significant consumable category in IVF laboratory programmes. This guide covers the specification rationale, compatibility checks, and storage density implications for laboratories considering the format.

What is a half size cryocane?

A half size cryocane is an aluminium rod or tube at approximately half the length of a standard full-length cryogenic cane (standard: 11.5 inches). Two half cane units occupy the same canister position as one full-length cane.

The material standard is aluminium. Key properties:

• Thermal conductivity supporting rapid sample cooling on entry to liquid nitrogen
• Mechanical robustness resistant to deformation under clinical handling
• Compatibility with 12 mm and 13 mm goblet formats
• Writing surface or colour tag attachment point at the flat top

Compatibility checklist before ordering

Before specifying half canes for an existing programme, verify the following:

Goblet diameter
Confirm whether your programme uses 12 mm or 13 mm goblets. Cane bore must match goblet diameter. Mismatch produces loose fit, instability, and retrieval risk.
Canister inner diameter
Half canes must fit the canisters in your existing dewars. Confirm outer diameter of the cane against canister bore specification.
Sleeve format
Half cryosleeves must be specified to match the half cane length. A full-length sleeve on a half cane will interfere with canister insertion and retrieval.
Dewar racking system
Confirm the racking system in your dewar accommodates two stacked half cane units per canister position without interference.

Storage density calculation

The capacity uplift from converting to half cane format is straightforward:

Format	Positions per canister	Cane units per canister
Full-length canes	4	4
Half size canes (stacked pairs)	4	8

Each half cane unit is separately retrievable. In a programme where individual patient embryo loads fit on one half cane, converting to half format effectively doubles the number of independently accessible patient groups per canister.

Why clear PVC matters for sleeves

PVC cryosleeve specification matters for two reasons in a clinical programme:

Durability: PVC maintains structural integrity, flexibility, and dimensional stability at -196°C through repeated thermal cycling. Cardboard alternatives historically used do not offer comparable durability or identification visibility.

Label visibility: Clear PVC allows identification labels to be read through the sleeve without removal. In a busy clinical programme, eliminating the sleeve removal step per retrieval event reduces handling time and thermal exposure across every access event over the storage lifetime of the programme.

When to consider half cane conversion

Half cane and half cryosleeve formats are most appropriate when:

• Individual patient embryo or gamete loads fit comfortably on a single half cane goblet column
• The programme is approaching canister or vessel capacity and wishes to delay infrastructure procurement
• Access granularity (retrieving one patient without disturbing adjacent canes) is operationally important
• The programme is establishing a new storage system and wishes to maximise density from the outset

Cryolab supplies half-size aluminium cryogenic canes and half PVC cryosleeves as part of its IVF laboratory consumables range. ISO 9001:2015 certified. More at www.cryolab.co.uk

Cryogenic Technology, Services and Solutions: The Technical Breakdown for Lab Professionals

Cryolab Global — Wed, 24 Jun 2026 09:30:28 +0000

The physics in 60 seconds

Critical biological preservation threshold: -130°C. Below this, cellular metabolism and enzymatic activity stop completely. LN2 at -196°C gives a 66°C buffer below that line. Post-thaw IVF survival with vitrification: 80-95%. Built entirely on maintaining samples below -130°C.

Global cryogenic storage equipment market: USD 7.8B (2025) → USD 13.2B (2034) at 6.8% CAGR.

Key advances in cryogenic tech

Vitrification: Ultra-rapid cooling into LN2 prevents ice crystal formation. Now standard in accredited IVF labs. Transformed post-thaw survival rates from 50-60% to 80-95%.

Vapour phase storage: Samples at -140°C to -190°C above liquid surface. Eliminates cross-contamination through liquid medium. Increasingly standard in regulated fertility programmes.

IoT monitoring: Continuous LN2 level and temperature monitoring, remote alarm notification, digital audit trails. Transforms manual checking into real-time data management.

Ultra-low evaporation vessels: Advanced multilayer vacuum insulation. Extended holding times. Reduced LN2 consumption.

Effective cryogenic solution components

Storage vessel (correct capacity, evaporation rate, phase configuration)
LN2 supply (14-day minimum buffer, secondary emergency contingency)
Monitoring (continuous, remote, out-of-hours alarmed)
Consumables (vitrification kits, cryocanes, cryosleeves)
Safety controls (O2 monitors, PPE, documented procedures)

Cryogenic service checklist

Daily vessel inspection required:

Frost/condensation on outer shell = vacuum failure = remove from service immediately
LN2 level vs previous day = detect abnormal evaporation rate
Written inspection log for every vessel

Pressurised vessels: PSSR 2000 compliance, written scheme of examination, competent person inspection.

O2 monitors: calibration on documented schedule. Out of calibration = no protection at 19.5% threshold.

Cryogenic transport

Scenario	Solution
Within facility	Purpose trolley, manual handling risk assessment
Between facilities	Dry shipper (absorbed LN2, no free liquid)
Air transport	IATA-compliant dry shipper only

Holding time must exceed transit time plus delay margin. Improper charging = primary cause of transport sample loss.

Dewar selection: the evaporation rate problem

0.1L/day vs 0.4L/day = 547L difference over 5 years. That gap in lifetime LN2 cost frequently exceeds the price premium between vessel tiers.

Vacuum failure: frost on outer shell or elevated evaporation rate = remove from service immediately. Transfer contents. Quarantine.

Dewar wall failure causes: mechanical impact, internal corrosion, age-related seal degradation.

Cryo storage industries

Common requirement: maintain below -130°C, adequate supply buffer, monitoring, documented procedures.

Cryolab | 40+ years | ISO 9001:2015 | https://cryolab.co.uk

Cryogenic Equipment, Tanks and Freezers: The Technical Breakdown

Cryolab Global — Tue, 23 Jun 2026 09:57:05 +0000

If you work in biotech, life sciences, or reproductive medicine and need to understand cryogenic equipment beyond the sales brochure, this is for you.

The core principle in 60 seconds

Cryogenic equipment maintains temperatures below -150°C using liquefied gases rather than mechanical refrigeration. In biological laboratories, this means liquid nitrogen at -196°C. The mechanism is vacuum insulation: a double-walled vessel with high vacuum between the walls, eliminating conductive and convective heat transfer. No power required. No moving parts. No compressor.

The critical biological preservation threshold is -130°C. Below that, cellular metabolism stops. A cryogenic vessel at -196°C gives you a 66°C buffer below that line.

Equipment categories

Laboratory storage dewars: Open-necked, non-pressurised, -196°C. The primary long-term storage vessel in IVF and biological research. Key specs: capacity, neck diameter, evaporation rate, racking system, vacuum integrity.

Vapour phase storage: Samples held above liquid surface at -140°C to -190°C. Eliminates cross-contamination risk through liquid medium. Preferred for regulated programmes.

Pressurised supply vessels: 5-10 bar operating pressure. Used for LN2 dispensing and bulk transfer, not sample storage. Subject to pressure system safety regulations.

Dry shippers: LN2 absorbed into internal porous matrix, no free liquid. IATA-compliant for air transport of cryopreserved material.

The evaporation rate variable

The single most underweighted spec in cryogenic procurement. Determines how fast the vessel loses LN2 and therefore the safety margin between top-ups. 0.1L/day vs 0.4L/day makes a significant difference in LN2 cost and operational risk over the vessel's lifetime. Always get the published figure before purchasing.

Vacuum failure indicators

Frost or condensation on outer shell
Abnormally high evaporation rate

Either = immediate removal from service. Transfer contents. Quarantine. Competent person inspection.

Cryogenic vs ULT mechanical freezers

	ULT Mechanical	Cryogenic LN2
Temperature	-80°C	-196°C
Power dependency	Yes	No
Moving parts	Yes (compressor)	None
Biological threshold met	No (-130°C required)	Yes
Power outage risk	High	None

Market context

Global cryogenic equipment market: USD 26.5B in 2025, forecast USD 45.4B by 2033 at 7% CAGR. Tank segment: 32.8% of revenue. Storage application: 56.2% of revenue. Nitrogen segment growing from USD 4.14B (2025) to USD 6.20B (2030).

Cryogenic gases in biological research

LN2 (-196°C): embryos, oocytes, sperm, stem cells, tissue
Liquid O2 (-183°C): medical gas
Liquid H2 (-253°C): emerging energy carrier
Liquid He (-269°C): MRI, superconducting magnets

Cryolab | 40+ years | ISO 9001:2015 | https://cryolab.co.uk

Liquid Nitrogen in the Lab: The Operational and Safety Guide That Doesn't Talk Down to You

Cryolab Global — Mon, 22 Jun 2026 14:25:10 +0000

If you work in a life sciences, biotech, or clinical research environment and you handle liquid nitrogen, this is for you. Not a beginner's explainer. The operational and safety detail that actually matters in practice.
The core physics in 60 seconds
LN2 boils at -195.8°C at atmospheric pressure. It is produced by fractional distillation of liquid air (nitrogen is 78 per cent of atmospheric air by volume). It is colourless, odourless, non-toxic, non-flammable, chemically inert at normal temperatures, and expands to approximately 694 times its volume when it evaporates to gas at room temperature.
That expansion ratio is the number behind almost every serious LN2 safety incident.
The critical biological threshold for cryopreservation is approximately -130°C. Below that point, cellular metabolism stops. LN2 gives you a 65°C buffer below that threshold under liquid phase storage conditions.
Supply models and what they mean for your lab
Two main supply routes exist in the UK: bulk tanker delivery to a fixed on-site installation, and scheduled cylinder or dewar delivery. The choice depends on monthly consumption, site infrastructure, and risk tolerance.
Bulk makes financial sense above roughly 500 to 800 litres per month, depending on your current cylinder pricing and delivery charges. Below that threshold, optimising your storage vessel choice for minimum evaporation rate is the more practical cost lever.
The operational risk that gets underestimated is supply buffer. Laboratories relying on scheduled deliveries need capacity to cover the delivery interval plus a meaningful safety margin for delays. A 14-day buffer is sensible minimum planning for any facility holding active biological samples.
Pricing variables worth understanding

Volume: bulk is materially cheaper per litre than cylinder
Geography: delivery distance adds cost for facilities outside urban corridors
Purity grade: standard grade suits most lab applications; research or medical grade carries a premium
Vessel evaporation rate: a dewar losing 0.4L/day versus 0.1L/day creates a meaningful annual LN2 cost difference

The four hazards - with the details that safety sheets skip
Cryogenic burns: Contact with LN2 at -195.8°C freezes tissue instantly. Burns appear superficial but damage continues below the surface. Lukewarm water rewarming. Immediate medical attention. The most common route to injury is routine sample retrieval without proper cryogenic gloves, not catastrophic accidents.
Asphyxiation: 1 litre of LN2 becomes approximately 694 litres of nitrogen gas. In an enclosed or poorly ventilated space, a modest spill can push oxygen below the HSE's 19.5 per cent threshold with zero sensory warning. Fixed O2 monitors with audible alarms are not optional in rooms with regular LN2 use.
Pressure explosion: Sealed containers without pressure relief devices will fail. Ice plug formation in open dewar necks is a specific documented hazard - the plug can be expelled at high velocity or the vessel can rupture. BCGA CP30: if you find an ice plug, vacate the area. Move to outdoors. Wait for it to clear naturally.
Oxygen enrichment: Cold surfaces cause atmospheric O2 to condense near pipework, valves, and dewar necks. Oxygen-enriched atmosphere or liquid contacting oil, grease, or flammables creates spontaneous combustion risk. Less talked about than asphyxiation. Equally real.
Storage temperature: the gradient inside your dewar
In liquid phase, temperature holds at -195.8°C as long as liquid is present. In vapour phase, temperature increases with height above the liquid surface. Samples stored near the top of a vapour phase vessel experience higher temperatures and greater variability during access events. This is not academic. For long-term embryo and oocyte storage, sample position within the vessel matters.
Pressure: open vs pressurised systems
Open dewars operate at near-atmospheric pressure. Pressurised dispensing cylinders typically run at 5 to 10 bar. UK regulatory framework: Pressure Systems Safety Regulations 2000 applies to pressurised vessels - written scheme of examination, competent person inspection, documented maintenance.
Regulatory checklist for UK labs

Management of Health and Safety at Work Regulations 1999: formal risk assessment for all LN2 activities
Manual Handling Operations Regulations 1992: applies to dewar movement
Pressure Systems Safety Regulations 2000: applies to pressurised vessels
BCGA CP30 Rev 3 2019: dewar use up to 50 litres
BCGA CP36: bulk cryogenic liquid storage
Pre-use inspection: frost/condensation on outer shell = vacuum failure = take out of service immediately

Context for the scale of this in UK healthcare
In 2023, more than 100,000 cycles of fertility treatment and storage took place in UK licensed clinics. Egg storage cycles grew 81 per cent between 2019 and 2022. All of it runs on LN2.
For UK laboratory LN2 storage vessels, safety equipment, and consumables: cryolab.co.uk

Why Your Cryogenic Storage is Working Against You (And What the Top UK IVF Labs Do Differently)

Cryolab Global — Fri, 19 Jun 2026 12:03:34 +0000

Most labs find out their liquid nitrogen storage has been quietly failing them not during an HFEA inspection, not during a near-miss incident, but during the 90 seconds a staff member stands at a tank with the lid open trying to locate a sample.

That 90 seconds is where temperature excursion happens. That 90 seconds, multiplied across a busy andrology unit running 20 sample retrievals a day, adds up to the single most preventable source of cryogenic storage degradation in UK fertility labs.

Real-World Evaporation vs the Spec Sheet

Every liquid nitrogen storage vessel sold in the UK comes with an evaporation rate figure. What the spec sheet does not tell you is that this figure is measured under static laboratory conditions — no canisters, no access cycles, no vibration.

In a working IVF lab, those conditions exist for approximately none of the working day.

Real-world evaporation in a busy unit can run 30 to 60 per cent higher than the published figure. A vessel showing 0.15 litres per day on paper may be consuming closer to 0.25 litres per day in a lab with eight to ten daily access cycles. Over a year, that is more than 36 litres per vessel disappearing into the consumables budget with no obvious cause.

The fix: match neck tube diameter to actual access frequency. Wide-neck vessels offer easier access but consistently higher evaporation. Narrow-neck vessels protect hold times but slow high-frequency retrieval workflows.

View the CryoNest, CryoCan and Dilvac range: https://cryolab.co.uk/product-category/storage-vessels/

Controlled Rate Freezer vs Vitrification — The Question Labs Ask Too Late

Vitrification and slow freezing are not competitors. They are tools for different situations.

Controlled rate freezing — using equipment such as the CBS DigitCool (https://cryolab.co.uk/product/cbs-digitcool-controlled-rate-freezer-range/) — remains the standard for ovarian tissue cryopreservation, stem cell banking, high-volume sperm banking, and research applications requiring reproducible cooling curves.

Vitrification dominates for oocytes and blastocysts because the ultra-rapid cooling rate prevents ice crystal formation rather than managing it. For day 5 and day 6 blastocysts, vitrification survival rates in UK HFEA-licensed units have consistently outperformed slow freezing.

The question is not which method is better. It is which samples you are freezing, at what volume, and whether your system supports both workflows.

Storage Capacity: Most Labs Underestimate by a Third

A clinic running 500 IVF cycles per year, with an average of two blastocysts cryopreserved per cycle and 3.5-year average storage duration, requires capacity for approximately 3,500 samples at any given time — before sperm storage, donor samples, or administrative lag.

Add 20 per cent buffer for administrative lag. Add 15 per cent if you run a donor programme. That is a 4,800-sample problem, not a 500-cycle problem.

The HFEA does not distinguish between a clinic that ran out of capacity through poor planning and one that ran out through rapid growth. Both generate an action point during inspection.

Purchase capacity for the patient volume you expect in three years, not today: https://cryolab.co.uk/contact-us/

Dry Shippers: What IATA Compliance Actually Requires

The failure point is charging. A dry shipper charged for less than the manufacturer-recommended time may show residual free liquid in the cavity. At that point it is no longer classified as a dry shipper — it is a liquid nitrogen container, subject to entirely different IATA dangerous goods regulations.

The CryoStork V3 (https://cryolab.co.uk/product/cryostork-v3/) and CryoStork V10 (https://cryolab.co.uk/product/cryostork-v10/) are designed for full charge within two to four hours.

Check before every consignment: tilt the charged shipper gently. If liquid moves, it is not ready.

Three Cryogenic Safety Hazards Missed in Standard Inductions

Standard inductions cover burns and gloves well. Three hazards get missed consistently:

Oxygen depletion in enclosed spaces. Liquid nitrogen expanding to gas displaces oxygen at approximately 700 to 1. In a poorly ventilated room, a single vessel leak can push oxygen below the HSE threshold of 19.5 per cent before any visible sign of a problem.

Embrittlement of non-rated PPE. Standard nitrile gloves become brittle at cryogenic temperatures and offer no meaningful protection. Only PPE rated specifically for cryogenic use counts. Cryolab safety wear: https://cryolab.co.uk/product-category/safety-wear/

Pressure build-up in sealed cryostraws. Sealed tubes warmed from cryogenic temperature create significant internal pressure as trapped nitrogen vaporises. Handle with face protection until stable at working temperature.

Cryolab has supplied cryogenic equipment and IVF laboratory consumables to UK fertility clinics, NHS trusts, sperm banks, and research institutions for over 40 years. ISO 9001:2015 certified.

Full article: https://cryolab.co.uk/cryogenic-storage-ivf-labs-uk-guide/
CryoGPT AI assistant: https://cryolab.co.uk/cryogpt
Contact: https://cryolab.co.uk/contact-us/

Cryo Storage System Design for IVF Labs, What Breaks and Why

Cryolab Global — Fri, 19 Jun 2026 08:30:20 +0000

There is a specific moment when the cryogenic storage decisions made at clinic launch stop being adequate. It rarely announces itself. The first sign is usually an accumulating series of small frictions — staff spending longer locating samples, LN2 top-up frequency creeping up, a near-miss during a busy period when a vessel was at lower fill than the log suggested.

These are not equipment failures. They are the predictable consequences of a cryo storage system sized for a clinic that no longer exists.

What a complete system looks like
A complete cryo storage system in a clinical IVF setting consists of: liquid nitrogen storage vessels with canister and cryocane organisation, a controlled rate freezer or vitrification workflow, cryostraws and carrier devices, identification accessories (visotubes, cryosleeves, cryocane coders), a liquid nitrogen dispensing system, safety wear rated to cryogenic standards, and a validated temperature and level alarm system.
The most common failure mode is not equipment malfunction. It is a system that was never designed as a system.

The canister depth problem
The variable most labs underestimate is canister depth relative to neck tube length. In a vessel accessed 15 or more times per shift, a canister whose top sits close to the neck tube opening during retrieval compounds into a measurable temperature excursion frequency over the working day.

Vacuum degradation as a hidden cost
A vessel showing early vacuum degradation running at 0.4 L/day instead of a specified 0.15 L/day adds approximately 91 litres per year per vessel. Across a fleet of eight vessels, undetected degradation in two or three units represents a significant untracked cost — rarely appearing as a line item in lab budgets.

Annual checks: evaporation rate vs baseline, external inspection for cold spots or frost, neck tube seal condition, canister and cane corrosion check.

Full range of cryo storage equipment: cryolab.co.uk

CryoGPT: Building a Domain-Specific AI Assistant for IVF Laboratory Science

Cryolab Global — Fri, 12 Jun 2026 09:42:15 +0000

A technical and operational overview of a specialist AI built on the Anthropic API for a regulated clinical sector.

Most AI assistants are generalists. CryoGPT is not.

CryoGPT was built by the Cryolab development team as a domain-specific AI assistant for IVF laboratories, embryologists, fertility clinics, and cryogenic equipment specialists. The architecture is straightforward: the Anthropic API, called via a secure server-side proxy (required to avoid NGINX cache issues on the SiteGround hosting environment), with a system prompt engineered to constrain responses to IVF and cryogenic laboratory science.

The decision to use a server-side proxy rather than a WordPress plugin approach was driven by the production environment. NGINX caching on the SiteGround stack intercepted API calls made through standard WordPress REST API routes, making a standalone PHP implementation in public_html the correct solution for this configuration.

Why Domain Specificity Matters in Clinical Science

General AI models produce plausible answers. In most use cases, plausible is sufficient. In a regulated laboratory environment, plausible is dangerous.

The boiling point of liquid nitrogen at atmospheric pressure is -195.8 degrees C. Not -196. The distinction is operationally relevant when calculating hold times for dry shippers during international biological specimen transport. The critical storage threshold below which biological time effectively stops is approximately -130 degrees C. Vitrification cooling rates must exceed 10,000 degrees C per minute to qualify as true vitrification rather than ultra-rapid freezing.

These are not edge cases. They are the standard queries that arrive from embryologists, laboratory managers, and NHS procurement teams on a daily basis.

The System Prompt Approach

The CryoGPT system prompt defines the assistant's operational domain: cryogenic storage science, IVF laboratory workflows, Cryolab equipment specifications, vitrification and slow-freezing protocols, and safety requirements including HSE oxygen depletion thresholds.

The prompt enforces British English throughout (this matters for a UK-regulated clinical audience), prevents the model from providing general-purpose responses outside the specialist domain, and incorporates verified fact-check figures that are tested against known incorrect values that appear in general AI outputs.

Access

CryoGPT is available at cryolab.co.uk/cryogpt. No authentication required. The assistant handles queries from the full range of IVF laboratory professionals and flags queries that require a human specialist at Cryolab.

LN2 Storage Vessel Specification for IVF Labs: Technical Reference

Cryolab Global — Wed, 10 Jun 2026 09:56:32 +0000

TEMPERATURE THRESHOLDS

LN2 boiling point: -195.8°C at atmospheric pressure
Critical biological threshold: approximately -130°C
Vapour phase operating range: -150°C to -190°C (fill-level dependent)
Liquid phase: -195.8°C
Both storage modes maintain below -130°C when correctly filled and monitored. The operational difference is not temperature — it is cross-contamination risk and thermal mass.

STATIC EVAPORATION RATE

Static evaporation rate is the volume of liquid nitrogen lost per day at ambient temperature with the vessel correctly filled and sealed. A low evaporation rate means less frequent top-ups and greater tolerance of supply disruptions. This specification is more operationally relevant than maximum capacity for labs with variable LN2 delivery schedules.

CAPACITY CALCULATION
Minimum capacity = (current occupied positions) + (24-month growth projection) + 20% contingency
The 20% covers: extended consents, patients not collecting on schedule, and storage of samples pending legal or welfare review.

VAPOUR VS LIQUID PHASE
Vapour phase: Cross-contamination risk eliminated, HFEA/ESHRE recommended for embryo storage, typical application = embryo banking
Liquid phase: Higher thermal mass, context-dependent suitability, typical application = sperm banking

MONITORING REQUIREMENTS (HFEA)
Regulated IVF storage requires continuous temperature monitoring, out-of-hours alarming, calibrated probes, alarm thresholds set below -130°C, and a documented out-of-hours response protocol. This is a licence condition, not guidance.

CRYONEST VS CRYOCAN
CryoNest: high-capacity vapour phase, rack-and-canister design, structured inventory management, suited to busy embryo banks with HFEA audit requirements.

CryoCan: broader size range, more flexible application, suited to labs with mixed storage requirements (andrology + embryo, satellite + main site).

Reference: cryolab.co.uk/product-category/storage-vessels/

Dry Shipper Specification for IVF Laboratories: A Technical Reference

Cryolab Global — Wed, 10 Jun 2026 09:23:22 +0000

This is a reference post for lab managers, embryologists, and procurement leads who want the technical specification detail behind dry shipper selection — not a sales overview.

THE PHYSICS THAT MATTERS
A dry shipper operates in LN2 vapour phase. The inner sorbent matrix (typically zeolite-based) is charged with liquid nitrogen until fully saturated. During transport, no free liquid is present. Nitrogen vapour off-gasses from the matrix maintaining internal temperature between -150°C and -190°C depending on fill level and vessel age.

The critical biological threshold is approximately -130°C. Below this, the glassy (vitreous) state prevents ice crystal formation and biological time effectively stops. All three CryoStork models (V2, V3, V10) maintain temperature well below this threshold when correctly charged.

IATA COMPLIANCE

Dry shippers correctly charged with no free liquid nitrogen are exempt from IATA PI 650 dangerous goods restrictions. This is verified by the inversion test: hold the vessel inverted for 10 seconds post-charge. Any liquid nitrogen exiting means the charge is incomplete.

MODEL COMPARISON

CryoStork V2 — 2L — Single-patient, courier, hand-carried
CryoStork V3 — 3L — Routine inter-clinic (1-3 patients)
CryoStork V10 — 10L — Multi-patient, sperm bank, long distance

PRE-TRANSFER CHECKLIST

Inversion test: no free LN2 after 10 seconds inverted
Temperature log verified (calibrated data logger)
Charge time recorded in traceability documentation
IATA paperwork complete (air freight only)

SORBENT DEGRADATION

Sorbent material degrades over time and with repeated charge cycles. An older vessel may fail the inversion test even after a full charge. Static hold time shortens progressively as sorbent capacity reduces. This is the most common cause of unexpected temperature excursion in vessels that have passed previous transfers without issue.

Full CryoStork range: cryolab.co.uk/product-category/dry-shippers/

Specifying LN2 Dewars for IVF Labs: What the Criteria Actually Mean

Cryolab Global — Fri, 05 Jun 2026 12:38:45 +0000

Source: Best LN2 Dewars 2026

Choosing a liquid nitrogen dewar for an IVF laboratory is not a consumer product decision. The vessel you select will store human embryos, oocytes, and gametes at -195.8 degrees C for years or decades, under UK regulatory oversight. The specification criteria are not abstract - they map directly to clinical outcomes, regulatory compliance, and operational cost.
What does hold time actually mean for laboratory operations?
Hold time is the period the vessel maintains cryogenic temperature without a refill under normal operating conditions. A hold time of 100 days means the vessel is accessed for topping up approximately three to four times per year. A vessel with a 30-day hold time means monthly maintenance cycles. For a busy NHS fertility department managing multiple vessels simultaneously, the difference in staff time and operational risk is significant.
How does neck diameter affect daily use?
Every time a vessel is opened for sample access, liquid nitrogen is lost through evaporation from the neck. A wider neck reduces the frequency with which staff need to lean awkwardly over the vessel and reduces the time samples spend in the neck zone - the warmest part of the vessel interior. Narrow necks increase both LN2 loss per access and the ergonomic risk associated with repeated daily retrieval.
" In a regulated UK IVF setting, any cryogenic storage vessel must be suitable for use under HFEA regulations. Your supplier should be able to confirm suitability and provide appropriate documentation. This is not optional. "
What distinguishes the CryoNest from mid-range alternatives?
The CryoNest series combines hold time performance, canister configuration suited to UK IVF consumable standards, and build quality designed for clinical-frequency access. The canister system accommodates the goblet and visotube setup most UK embryologists already use, which means no forced change to consumable protocols when the vessel is installed.
What are the running cost implications of vessel choice?
A vessel with poor insulation consumes more LN2 per day than a well-specified alternative. Over a five-year lifespan, the difference in supply cost can be substantial - in many cases exceeding the original purchase price differential. Specify LN2 consumption rate as part of the tender requirement, not just purchase price.
View the CryoNest and CryoCan ranges at cryolab.co.uk.

IVF Cryogenic Storage Capacity: The Numbers Behind the Decision

Cryolab Global — Fri, 05 Jun 2026 12:31:01 +0000

Embryo storage capacity planning is a numbers problem. The calculations are not complex, but labs consistently get them wrong by skipping growth modelling and backup segregation. Here is a systematic walkthrough aimed at laboratory managers and biomedical engineers specifying cryogenic infrastructure.
What is the correct formula for storage capacity planning?
Target capacity = (current straw count + (net annual growth x 5 years)) x 1.2. That 1.2 multiplier is your 20 percent buffer for unexpected growth, administrative delays in sample disposal, and general operational headroom. Run the number before you open a procurement catalogue, not after.
How do you calculate net annual straw growth?
New storage patients per year x average straws per patient, minus straws leaving the system through patient discharge, transfer, or disposal. The complication is the 55-year storage limit introduced under the Health and Care Act 2022. With consent renewable every 10 years, a proportion of your inventory will remain active for decades. Your growth model needs to account for this slower attrition rate in long-term storage cohorts.
" The physical straw capacity of a vessel is the product of four numbers: canisters per vessel, goblets per canister, visotubes per goblet, straws per visotube. Litres of liquid nitrogen is a cooling parameter, not a storage capacity metric. "
What is a realistic per-vessel straw capacity for NHS-scale infrastructure?
A large-capacity vessel configured with six canisters, typical goblet stacking, and standard visotubes will hold between 1,200 and 1,500 straws depending on exact consumable dimensions. An NHS fertility department managing 5,000 stored embryo batches at three straws each - 15,000 straws - needs ten to twelve vessels of this configuration for primary storage, plus separate backup provision.
How do you account for vessel downtime in the specification?
Planned maintenance, LN2 topping-up schedules, and emergency scenarios all create temporary capacity constraints. Build at least one vessel's worth of spare capacity into your specification beyond the growth-adjusted figure. In a live clinical environment you will never regret having headroom; you will regret not having it.
Where does liquid nitrogen supply fit into the calculation?
Consumption is a function of vessel count, access frequency, and ambient temperature in the storage room. Running six vessels accessed daily in a busy NHS unit consumes significantly more LN2 than the same vessels accessed weekly in a satellite clinic. Model this before you finalise your supply contract.
Cryolab supplies IVF laboratories across the UK with the full range of cryogenic storage vessels including the CryoNest and CryoCan series. View the storage vessel range at cryolab.co.uk.