IVF Due Date Calculator (FET)

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How the IVF Due Date Calculator Works:

Modern assisted reproduction technologies have helped countless couples experience parenthood. Most couples going through IVF procedures are eagerly awaiting their due date to finally meet their child. The pregnancy calendar allows you to determine the date of birth of the baby.

With the correct determination of the timing of pregnancy, doctors and the expectant mother know in advance the approximate date of the onset of labor. This allows them to prepare for this process, identify possible complications and choose the appropriate delivery method. That is why it is so necessary for pregnant women to regularly visit a doctor as part of an IVF program and calculate their due date.

How IVF Due Date is Calculated  (Naegele’s Rule and Mathematical Method)

First let’s briefly discuss how the due date is calculated in the case of natural conception and then compare it to the IVF due date calculator.

The normal duration of pregnancy is approximately 36 to 42 weeks. An average number is 40 weeks or 280 days. In case of natural conception, treatment with fertility drugs or IUI (intrauterine insemination), due date calculations are based on to first day of LMP – last menstrual period, due date can be calculated according to:

Naegele’s Rule

This method works best in cases where the patient has a regular (28 day) menstrual cycle without significant fluctuations. 3 months are subtracted from the first date of the last monthly period and 7 days and 1 year are added.

Mathematical method

Just by adding the average period of pregnancy – 280 days to the start date of the last menstrual period, you can get the estimated date of the birth.

On the other hand, in the case of IVF, everything is much easier, since we know the exact date of conception as it is done artificially in the lab. Therefore, tracking ovulation is not needed like it is for a natural pregnancy.

The start dates are scheduled and due date calculation is possible just by adding 266 days to the egg retrieval or embryo transfer date.

To use the IVF due date calculator you need an exact date of one of the following:

IVF with own eggs

In this case, where eggs are retrieved from the mother, rather than a donor, and then fertilized in the lab, 266(38 weeks) days are added.

Egg retrieval date + 266 days

Day 3 embryo transfer or day 3 FET

An embryo consisting of several cells is transferred 3 days after fertilization. Since the embryo is considered to already be 3 days “old,” 263 days are added to the transfer date in this case instead of 266.

Transfer date + 263 or Transfer date + 266 – 3

Day 5 embryo/blastocyst transfer or day 5 FET

The embryo is transferred 5 days after fertilization. Since the embryo is considered to already be 5 days “old” 261 days are added to the transfer date in this case instead of 266 days.

Transfer date + 261 or Transfer date + 266 – 5

IVF with fresh donor egg cycle

In this instance, where the donor’s eggs are fertilized, 266 days are added

Egg retrieval date + 266 days

Fresh donor embryo cycle

Consisting of retrieval and fertilization of donor eggs, 266 days(38 weeks) are added

Egg retrieval date + 266 days

Confidence of IVF Due Date Calculator

Despite the fact that IVF due date calculation estimates are typically much more accurate compared to pregnancies following natural conception, an IVF due date calculator does not guarantee absolute accuracy. In any case, a detailed medical examination is required to confirm the probable due date.

The actual due date is based on factors like the health of the mother and fetus, the number of fetuses, the mother’s hormonal balance, fetal positions and so on. Therefore, the IVF due date calculation is an estimate, likely to be within +/- 2 weeks accuracy.

Estimating a baby’s due date of day with the help of IVF due date calculator aids the expectant mother herself, in general terms, to plan her pregnancy.

Every pregnancy is individual and unique in its own way, thus prognosis can not be the same for every IVF pregnancy. That’s why you need constant communication with your physicians and fertility doctor and midwife during the pregnancy period. In fact only about 5% of babies arrive on their due date.

Multiple Gestations

In cases of multiple gestations (twins, triples, etc.) the IVF due date formula changes, since a greater number of gestations raises the risk for a shorter pregnancy.

After using the aforementioned rule of adding 266 days (minus 3 days in 3 day embryo, minus 5 days in 5 day embryo)

In the case of twins we subtract 21 days from that number.

In the case of triplets we subtract 49 days from that number.

See Also

Grants for IVF





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