How to calculate the expected date of delivery after pregnancy by test tube method
Test tube baby technology has become an important means in modern medicine, helping many infertile couples achieve their reproductive dreams. Once the pregnancy is successful, pregnant women and their families will naturally care about the expected date of delivery, so as to make arrangements for the follow-up prenatal examination and preparation. This article will elaborate on how to calculate the expected date of delivery after IVF pregnancy from four aspects.
Use the date of embryo transfer to calculate the expected date of delivery
In IVF technology, embryo transfer is a key step. Generally speaking, HCG in blood or urine can be detected 14 days after embryo transfer to determine whether the embryo is pregnant. If the result is positive, doctors can calculate the expected date of delivery according to the date of embryo transfer and the number of days after conception. Generally, 14 days after embryo transfer is the pregnancy date, and 280 days (about 40 weeks) can be added to get the expected delivery date.
However, the date of embryo transfer is not always an accurate and reliable predictor. Sometimes, doctors determine the number of days after conception based on the results of ultrasound examination, which is more accurate. Ultrasonography can measure the size and shape of embryonic development, so as to calculate the number of days after conception and the expected date of delivery.
Estimating the expected date of delivery according to the pregnancy window
The pregnancy window period refers to the best time for pregnancy in a woman's menstrual cycle. In IVF technology, doctors usually determine the best pregnancy window according to women's menstrual cycle and ovulation time, so as to improve the success rate of pregnancy. For women who successfully conceive during the pregnancy window, the expected date of delivery can also be calculated by the difference between the ovulation date and the embryo transfer date.
However, it should be emphasized that the determination of the pregnancy window is not an accurate prediction method, because the menstrual cycle of patients may change, and their physical conditions will also affect the ovulation time. Therefore, this method is only for reference and needs to be combined with other indicators to calculate the expected production date.
Calculating the expected date of delivery based on the pregnant women's conscious symptoms
In the early pregnancy, pregnant women may have some conscious symptoms, such as breast pain, nausea, vomiting, etc., which are all manifestations of elevated levels of pregnancy hormone. The doctor can accurately calculate the expected date of delivery by the time when the pregnant women feel the symptoms.
However, the occurrence time of pregnant women's conscious symptoms varies from person to person, and different pregnant women may have different feelings. Therefore, it is not reliable to calculate the expected delivery date only based on pregnant women's conscious symptoms, and it needs to be confirmed in combination with other indicators.
Use pregnancy ultrasound to calculate the expected date of delivery
Ultrasonography during pregnancy is one of the most reliable methods to determine the expected date of delivery. By observing the development, size and shape of embryos with ultrasound, doctors can accurately calculate the expected date of delivery.
In the prenatal ultrasound examination, the doctor can measure the head buttock length (CRL) of the embryo, and then determine the age and due date of the embryo according to the CRL value and the standard growth curve. In addition, ultrasound can also observe fetal heart beat, placental position and other indicators to further confirm the expected date of delivery and the development of the embryo.
Summary
The estimated delivery date after IVF technology pregnancy can be calculated by many methods, such as embryo transfer date, pregnancy window period, pregnant women's conscious symptoms and pregnancy ultrasound. However, it should be noted that each method has certain limitations and errors. Therefore, in order to determine the expected date of delivery more accurately, it is recommended that women regularly carry out prenatal examination and ultrasound examination under the guidance of doctors during pregnancy, so as to timely understand embryonic development and determine the expected date of delivery.
