Calculation method of test tube baby's due date
IVF is an embryo that is cultivated in the laboratory and transferred to the uterus through assisted reproductive technology. For the parents of test tube babies, it is very important to know the expected date for pregnancy preparation, production preparation and infant care. Four common methods for calculating the expected delivery date of test tube babies are introduced below.
1. Calculation of embryo transfer date
The calculation method of embryo transfer date is to predict the expected delivery date of the baby according to the specific date of embryo transfer. Generally, the urine pregnancy test of pregnant women is carried out about 14 days after embryo transfer. If the result is positive, it means that the transfer is successful. Taking this date as the starting point, plus the pregnancy period of 40 weeks (280 days), you can get the expected date of birth.
However, it should be noted that each woman's ovarian cycle and cycle length are not exactly the same, so this method is only a rough estimate. The actual expected date may be within a few days before or after this date.
2. Calculation of B-ultrasonic inspection
The expected date of delivery can be calculated by multiple B ultrasound (ultrasound) examinations at a specified time interval, combined with the size and development of the fetus. During the B-ultrasound examination in the early pregnancy, the doctor will measure the fetal head circumference, abdominal circumference, femur length and other indicators. According to these data, the expected delivery date of the fetus can be calculated by formula.
Compared with the calculation method of embryo transfer date, the calculation method of B-ultrasound examination is more accurate, and the time range of expected delivery date can be determined according to the specific situation of pregnant women.
3. Labor cycle calculation
In assisted reproductive technology, the artificial cycle is controlled by the use of ovulation promoting drugs to develop follicles. After the egg is successfully fertilized, the embryo will be cultivated in the laboratory for a period of time before embryo transfer. Therefore, in this case, the expected date of delivery can be calculated by the time of follicle development and embryo cultivation in the artificial cycle.
However, the artificial cycle calculation method also has some limitations. For example, the physical condition of pregnant women, different ovarian responses and other factors may affect the accuracy of the expected delivery date.
4. Calculation of the last menstrual period
The calculation method of the last menstrual period is to estimate the expected date of delivery based on the date of the last menstrual period. Generally, a woman's menstrual cycle is 28 days, ovulation occurs around the 14th day of the cycle, and pregnancy may occur within 24-48 hours after ovulation. By adding or subtracting these days, plus the pregnancy period of 40 weeks (280 days), we can get the expected date of delivery.
However, this method is only a rough estimate, because women's menstrual cycle may be irregular, and the ovulation date may also change.
Summary
For the calculation method of IVF baby's due date, we introduced the calculation method of embryo transfer date, B ultrasound examination, artificial cycle and last menstrual period. Each method has its advantages, disadvantages and scope of application.
The calculation method of embryo transfer date is simple and easy, but its accuracy is relatively low; The calculation method of B-ultrasonic inspection is more accurate, but it needs multiple inspections; The artificial cycle calculation method is applicable to women who have been treated with ovulation promoting drugs, but the time of embryo cultivation after pregnancy is uncertain; The calculation method of the last menstrual period is applicable to women with regular menstruation, but there is still uncertainty.
When choosing the calculation method of the expected date of birth, the parents of IVF should choose according to their own specific conditions and the doctor's suggestions. Whichever method you choose, you should be aware that the expected date of birth is only an estimate, and the actual baby may be born within a few days before and after the expected date of birth.
Therefore, parents should ensure sufficient time and resources to cope with possible uncertainties in terms of pregnancy preparation, birth preparation and infant care.
