1. What is IVF EDD Calculation?

The IVF EDD (Estimated Due Date) calculation determines the expected delivery date for pregnancies conceived through in vitro fertilization. It uses the embryo transfer date as the reference point, adding 266 days (38 weeks) to calculate the due date.

2. How Does the Calculator Work?

The calculator uses the IVF due date formula:

Where:

• \( EDD \) — Estimated Due Date
• \( Transfer Date \) — Date of embryo transfer
• \( 266 days \) — Standard gestation period from transfer

Explanation: This calculation accounts for the precise knowledge of conception timing in IVF pregnancies, providing a more accurate due date than traditional pregnancy dating methods.

3. Importance of IVF Due Date Calculation

Details: Accurate due date calculation is crucial for monitoring fetal development, scheduling prenatal care, planning for delivery, and ensuring optimal timing for interventions if needed.

4. Using the Calculator

Tips: Enter the exact embryo transfer date. The calculator will automatically compute the estimated due date by adding 266 days (38 weeks) to the transfer date.

5. Frequently Asked Questions (FAQ)

Q1: Why 266 days instead of 280 days?
A: In natural pregnancies, dating starts from the last menstrual period (LMP), adding 280 days. In IVF, we know the exact conception date, so we add 266 days from embryo transfer.

Q2: Does this work for all types of embryo transfers?
A: Yes, this calculation applies to fresh transfers, frozen embryo transfers (FET), and donor egg cycles where the transfer date is known.

Q3: What about day 3 vs day 5 embryo transfers?
A: The 266-day calculation is typically used for day 5 blastocyst transfers. For day 3 transfers, some providers may use 263 days, but 266 days is commonly used as standard.

Q4: How accurate is the IVF due date?
A: IVF due dates are generally more accurate than LMP-based dates since the conception date is precisely known. Only about 5% of women deliver on their exact due date.

Q5: Should I adjust for multiple pregnancies?
A: Multiple pregnancies often deliver earlier than singletons, but the initial due date calculation remains the same. Your healthcare provider will monitor closely for appropriate delivery timing.