IVF Process
•6 min read

Reverse IVF Due Date Calculation

Back-calculate your IVF embryo transfer date from a known due date using stage-specific offsets for Day 3/5/6/7 embryos; includes worked examples and tips.

Dr. Michael Chen
January 18, 2025
6 min read

Reverse IVF Due Date Calculation

To back-calculate your embryo transfer date from a known due date (EDD), subtract the embryo age from the standard 280-day pregnancy length.

  • Day 3 embryo: EDD − 263 days = transfer date
  • Day 5 embryo (blastocyst): EDD − 261 days = transfer date
  • Day 6 blastocyst: EDD − 260 days
  • Day 7 blastocyst: EDD − 259 days

This provides a precise estimate because IVF timing is known. Confirm with your clinic records.

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