POWER IVF｜US & Mexico IVF: How to Calculate Your Due Date - Get It Now!

2025-05-28 08:39:17，visits： 16

 

For expectant mothers who have successfully conceived through in vitro fertilization (IVF), accurately calculating the estimated due date is crucial. This not only dictates the schedule for subsequent prenatal check-ups but also influences decisions regarding the mode of delivery. Unlike natural conception, the calculation of the due date for IVF pregnancies requires considering the timing of embryo transfer.

 

First, it's essential for expectant mothers to understand what the estimated due date is. The due date is a medical prediction of the duration of pregnancy and the anticipated time of delivery, typically calculated by adding 280 days, or 40 weeks, from the first day of the last menstrual period. This date serves as a vital guide for planning prenatal screenings (such as NT scans and Down syndrome screening), monitoring fetal development, and determining when to consider terminating the pregnancy (e.g., induction or Cesarean section). Inaccurate due date calculation leading to premature intervention can have adverse effects on both mother and child.

 

So, for IVF mothers who have undergone ovarian stimulation, egg retrieval, and embryo transfer, how is the starting point for calculating the due date determined? Since fertility medications affect the normal menstrual cycle, the last menstrual period cannot be used as a reliable reference. The scientific calculation method is as follows: if you had a Day 5 blastocyst transfer (an embryo cultured for 5 days), count back 19 days from the transfer date and consider that date as the first day of your "last menstrual period." If you had a Day 3 embryo transfer (an embryo cultured for 3 days), count back 17 days from the transfer date to establish the starting point.

 

Dr. Nathan Zhang specifically points out that many countries often perform embryo transfer on day 3 of development in IVF treatment, a practice considered to have lower success rates compared to the United States, which boasts world-leading embryology laboratories. These advanced labs have the capability to culture embryos to the blastocyst stage (Day 5). Blastocysts, containing over 100 cells, can undergo IVF-PGT (preimplantation genetic testing), effectively screening for chromosomal abnormalities and genetic disorders to ensure that only healthy embryos are transferred. This significantly increases the IVF success rate and reduces the risk of miscarriage and stillbirth.

 

In addition to self-calculation based on the transfer date, the estimated due date will also be assessed and adjusted during prenatal ultrasound examinations. It's important to remember that the due date is not an exact delivery date; statistics show that only about 5% of pregnant women give birth on their exact due date. The baby's birth time is influenced by various factors, such as the uterine environment, fetal development, and the mother's physical condition. Therefore, many babies arrive earlier or later than their estimated due date. Expectant mothers should be prepared for delivery around 37 weeks of gestation and maintain a relaxed attitude, allowing nature to take its course. Furthermore, evaluating the maturity of IVF babies requires considering not only the gestational age but also factors like the baby's weight.

Having grasped the method for calculating the estimated due date for IVF babies, expectant mothers should next focus on diligently attending prenatal check-ups according to their gestational week, safeguarding the healthy arrival of their baby! If you have any questions during your IVF journey, please do not hesitate to contact Dr. Nathan Zhang and the IVF USA team. With over a decade of experience in overseas assisted reproductive consultation services, IVF USA collaborates with leading IVF doctors worldwide, providing comprehensive support for your fertility aspirations. Let us work together to be well-prepared for a bright future!