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IVF Due Date Calculation:
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The IVF due date calculation estimates the expected delivery date for pregnancies conceived through in vitro fertilization. Unlike natural pregnancies that use the last menstrual period, IVF calculations are based on the precise embryo transfer date.
The calculator uses the standard IVF due date formula:
Where:
Explanation: This calculation adds 266 days (38 weeks) to the embryo transfer date, which represents the typical gestation period from conception to delivery for IVF pregnancies.
Details: Accurate due date calculation is crucial for proper prenatal care scheduling, fetal development monitoring, and delivery planning. IVF provides the most precise conception date available in reproductive medicine.
Tips: Enter the exact date of embryo transfer. The calculator will provide the estimated due date based on the standard 266-day gestation period for IVF pregnancies.
Q1: Why 266 days instead of 280 days?
A: Natural pregnancy calculations use 280 days from the last menstrual period (which includes about 2 weeks before conception). IVF calculations use 266 days from the actual conception/transfer date.
Q2: Does this work for fresh and frozen transfers?
A: Yes, the calculation is the same for both fresh and frozen embryo transfers, as it's based on the transfer date regardless of embryo status.
Q3: What about day 3 vs day 5 transfers?
A: For day 3 transfers, some practitioners add 263 days, while day 5 transfers use 261 days. However, 266 days is the most commonly used standard.
Q4: How accurate are IVF due dates?
A: IVF due dates are the most accurate of any pregnancy dating method since the conception date is precisely known. Only about 5% of babies are born 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 doctor will monitor closely and adjust expectations as needed.