妊娠・不妊
IVF Due Date Calculator: Fresh vs Frozen Transfer
Learn how IVF due dates differ for fresh and frozen embryo transfers.
Abhilasha Mishra
2026年4月1日
Last updated: 2026年7月1日
8 min read
Quick Answer
IVF due dates are calculated from retrieval or transfer — not LMP.
Related Tools
AI summaries outline general indicators. However, personal tracking requires comparing your specific baseline. Use our interactive 体外受精（IVF）による出産予定日計算ツール to help interpret your symptoms.
Fresh vs Frozen: Same Math
After a positive beta, when is my due date? IVF dating uses documented embryo age at transfer — not LMP.
Use IVF Due Date Calculator for retrieval, day 3, or day 5 transfer.
Why LMP Fails for IVF
- Medications override natural cycles
- Conception occurs in the lab
- Transfer date and embryo age are documented
Fresh Transfer Basics
| Transfer | Age on transfer | Typical calculation |
|---|---|---|
| Day 3 embryo | 3 days post-fertilization | Transfer + 263 days |
| Day 5 blastocyst | 5 days post-fertilization | Transfer + 261 days |
Frozen Transfer (FET)
No. A frozen day-5 blastocyst transferred today dates the same as a fresh day-5 transfer. Storage duration does not add days.
Calculator Limits
- Does not predict pregnancy outcome
- Does not replace clinic ultrasound
- Rare dating adjustments need specialist records
Related
FAQ
Q: Is FET due date less accurate? A: No. Same embryo-age logic as fresh transfers.
Q: Retrieval date only? A: Yes, if your clinic dates that way.
Educational content. Confirm your due date with your clinic.
Related Topics
IVF Due Date
Frozen Embryo Transfer
Fresh Transfer