1. What is IVF Due Date Calculation?

The IVF due date calculation accounts for the age of the embryo at transfer, unlike natural conception due dates which are typically calculated from the last menstrual period. This provides a more accurate estimation of pregnancy duration for IVF pregnancies.

2. How Does the Calculator Work?

The calculator uses the IVF-specific formula:

Where:

• 266 days — Standard length of pregnancy from conception
• Embryo Age — Days of embryo development before transfer (typically 3 or 5 days)

Explanation: The calculation adjusts for the embryo's development time in the lab before transfer to provide an accurate due date.

3. Importance of Accurate Due Date

Details: An accurate due date is crucial for proper prenatal care, timing of tests, and monitoring fetal development. IVF pregnancies benefit from precise dating since the conception date is known exactly.

4. Using the Calculator

Tips: Enter the exact embryo transfer date and the embryo's age in days (typically 3 for day-3 embryos or 5 for blastocysts). The calculator will provide the estimated due date.

5. Frequently Asked Questions (FAQ)

Q1: Why is 266 days used instead of 280?
A: 280 days (40 weeks) is counted from the last menstrual period (LMP). 266 days (38 weeks) is the actual gestation period from conception.

Q2: What embryo ages are typical?
A: Most transfers use day-3 embryos (3 days old) or day-5 blastocysts (5 days old).

Q3: Does this work for frozen embryo transfers?
A: Yes, the same calculation applies regardless of fresh or frozen transfer.

Q4: How accurate is this calculation?
A: Very accurate for IVF pregnancies since the conception date is known precisely.

Q5: Should I adjust for my menstrual cycle length?
A: No adjustment is needed for IVF due dates as they're based on embryo age, not menstrual cycle.