1. IVF Due Date Calculation

The IVF due date calculator estimates the expected delivery date for pregnancies achieved through in vitro fertilization (IVF). Unlike natural conception, the conception date in IVF is precisely known.

2. How the Calculation Works

The calculator uses the standard IVF formula:

This calculation assumes:

• 266 days gestation from embryo transfer (38 weeks)
• Day 3 embryo transfer (for day 5 transfers, subtract 2 days)
• Standard pregnancy duration

3. Why 266 Days?

Explanation: 266 days represents 38 weeks of gestation from embryo transfer. This accounts for:

• 2 weeks before fertilization (standard pregnancy dating)
• 38 weeks from conception to delivery (total 40 weeks)

4. Using the Calculator

Instructions: Simply enter your embryo transfer date. The calculator will add 266 days to determine your estimated due date.

5. Frequently Asked Questions (FAQ)

Q1: Does this work for frozen embryo transfers?
A: Yes, the same calculation applies to both fresh and frozen embryo transfers.

Q2: What if I had a blastocyst (day 5) transfer?
A: For day 5 transfers, you can subtract 2 days (use 264 days) since the embryo is more developed at transfer.

Q3: How accurate is this calculation?
A: Very accurate for IVF pregnancies since we know the exact conception date. However, normal pregnancy variations still apply.

Q4: Should I adjust for multiple pregnancies?
A: Twins/triplets often deliver earlier, but the due date calculation remains the same. Your doctor will monitor closely.

Q5: How does this compare to LMP dating?
A: IVF dating is more precise than last menstrual period (LMP) dating which assumes ovulation on day 14.