For developers building fertility lab software or anyone who wants to understand the process at a mechanistic level: oocyte vitrification is ultrarapid cryogenic cooling that avoids ice crystal formation. Here's how it works.
Phase 1 - Equilibration: Oocyte is exposed to low-concentration cryoprotectant solution for 10-15 minutes. Water begins leaving the cell via osmosis, replaced by CPA.
Phase 2 - Vitrification solution: High-concentration CPA solution (typically DMSO + EG + sucrose). Brief exposure (60-90 seconds). Cell loads with CPA rapidly.
Phase 3 - Loading onto carrier: Minimum possible volume (often under 0.1 microlitre) loaded onto the carrier surface. Volume is rate-limiting for cooling speed.
Phase 4 - Plunge into liquid nitrogen: Carrier contacts LN2 immediately. Cooling rate achieved: up to 20,000 degrees C/min. Water vitrifies (glass-like amorphous state), no crystals.
Warming (reverse process): LN2 carrier to 37C warming solution. Rapid dilution series removes CPAs. Sucrose gradient manages osmotic shift. Final wash. Assess survival.
Key data variables: CPA concentration and exposure time, carrier volume, cooling rate, warming rate, sucrose concentration at each step, and post-warm survival assessment data.
UK labs - carrier and warming kit supplies: Cryolab Vitrification Kits
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