Embryo cryopreservation

Our program provides cryopreservation for blastocyst stage embryos. This is an option if there are excess embryos available beyond those that are chosen for the initial transfer. About 90 percent of embryos that are cryopreserved by this technique will survive the freezing and later warming process.

  • Embryos that are cryopreserved are put in 1 of the lab’s liquid nitrogen storage tanks. Each place in the tank has a unique identifier that results from 4 location codes. The identifier, IVF case number, and your last name are on each straw used for cryopreservation.
  • The cryopreservation record has the:
    • Location description
    • Your name, medical record number, and date of birth
    • IVF case number
    • Straw numbers
    • Number of embryos in each straw,
    • Date and embryo stage of cryopreservation
    • Name of embryologist doing the cryopreservation
  • After cryopreservation, the information on the straws is crossed matched with the cryopreservation record before the straws are placed in permanent storage.
  • A similar process is followed when the embryos are thawed. 
  • Embryos may be cryopreserved as late as embryo culture day 6. The lab will send you a MyChart message with a final embryo report. 


Last reviewed: 
November 2021

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