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Calculating Your IVF Due Date

By Vicken Sahakian, M.D. on July 19, 2017

A pregnant woman holding an ultrasound pictureAt Pacific Fertility Center, we offer the latest advancements in in vitro fertilization (IVF) treatment to help women and couples dealing with infertility greatly improve their chances of becoming pregnant. When IVF is successful, the first question many women have is “what is my due date?” Fortunately, calculating an IVF due date is easy and more accurate than calculating a due date from natural conception, as we'll explain below. For help calculating your IVF due date, please contact our Los Angeles, CA fertility center today.

About Due Dates

Due dates are used to estimate the time frame in which a baby may be born. Due dates are based on a 40 week gestational period, but a healthy baby may be born between 37 to 42 weeks. In fact, few women, about 10 percent, actually give birth on their estimated due date.

When natural conception has occurred, due dates are calculated by adding 40 weeks, or 280 days, to the date of the first day of a woman's last menstrual cycle. This date is used since it can be difficult to know exactly when ovulation occurs. Additionally, as previously mentioned, is only an estimation of the date a baby may be born.

Calculating an IVF Due Date

For women who have conceived with IVF, calculating the due date is done slightly differently since the date of ovulation is known. This allows a more accurate estimation of a woman's due date.

There are different starting points from which an IVF due date may be calculated. These starting points include the date of egg retrieval or the date of a 3-day or 5-day embryo transfer.

How to Calculate an IVF Due Date Using the Date of Egg Retrieval

When using the date of egg retrieval, or egg harvesting, you simply add 38 weeks, or 266 days, to this date. 38 weeks are added instead of 40 weeks since the eggs must be retrieved at the start of ovulation, which means the date of ovulation is known.

An example of this method would be starting with an egg retrieval date of July 1 and counting out 38 weeks from this date. This will give you an estimated due date of March 24 of the following year.

How to Calculate an IVF Due Date Using the Date of Embryo Transfer 

The IVF due date may also be calculated using the date of a 3-day or 5-day embryo transfer. To use the date of embryo transfer, count 38 weeks from the date of transfer. Next you will need to subtract the age of the transferred embryo. If the embryo was transferred at 3 days, simply subtract 3 days from 38 weeks, or 5 days if the embryo was transferred after 5 days.

Learn More about Fertility Treatments

If you are struggling with infertility and would like to learn more about treatments that may help you realize your dreams of growing your family, please schedule a consultation with our fertility specialists today.

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