How To Calculate The Standard Gestational Age Like?
Calculating gestational age is a way for mothers to assess fetal development in the womb. However, the calculation of gestational age often has a disagreement between the mother and the doctor. So the calculation of the gestational age of doctors is like?
The main purpose of calculating gestational age
Pregnancy calculator helps mothers as well as doctors monitor and evaluate fetal development in the uterus. In addition, calculating the gestational age is also a milestone that clinicians can base on which to make decisions about the necessary tests at each appropriate time.
In addition, calculating the gestational age will help to calculate the date of birth for women and also helps mothers to monitor and compare each stage of pregnancy to see if the standard is met or not to make appropriate adjustments.
Should calculate gestational age by week or by month?
Usually the weekly gestational age is usually more accurate. Pregnant women will know the specific maturity of the fetus through each milestone in detail. Moreover, the calculation of gestational age by month has an error due to the uneven number of days of each month, with 28 days, 30 days and 31 days, especially in February of leap years
Calculating gestational age by week is usually more accurate
Calculation of gestational age of doctors
Usually, couples usually calculate the gestational age from the date of relationship to the present time.
However, doctors charge it differently. Doctors will calculate the gestational age from the first day of the last period of a woman to the current milestone. Therefore, usually the doctor's calculation will differ from the gestational age by the usual calculation above about two weeks.
Conception begins when the egg and sperm meet. Normally, in the vaginal environment, sperm can survive for two to three days and move up to the uterus, to the fallopian tube and to meet the egg in 1/3 of the outer fallopian tubes. Ovulation can last about one to two days. Therefore, if there is a relationship about three days before ovulation and about two days after ovulation, it is possible to conceive
Therefore, the doctor will calculate the gestational age from the last menstrual period because it is the only landmark to determine possible conception.
Other methods of determining gestational age
In addition to the method of determining the age of pregnancy according to the first day of the last period, there are two other ways that can help the mother accurately calculate the gestational age, which is ultrasound and measuring the height of the uterus.
Ultrasound is considered to be the most accurate method of determining the gestational age and takes place around the first 3 months of pregnancy. This is the time when the fetus begins to develop and does not depend much on factors other than gestational age, so the results will be highly accurate.
When conducting an ultrasound, the doctor will measure important dimensions such as the fetal sac, the length from head to buttock. Based on the numbers will calculate the gestational age of the baby. The most ideal time for ultrasound to perform is from 10 weeks to 13 weeks.
Ultrasound method for calculating the most accurate gestational age
Measure the height of the uterus
Another method to help calculate gestational age is to measure the distance from the pubic bone to the base of the uterus to determine. Normally, after the first month, the height of the uterus increases by 4cm every month.
Based on that change, the fetal age can be determined by the formula:
Gestational age (in months) = uterine height / 4 + 1
In addition to the formula, women can also estimate the gestational age by the following landmarks:
12 weeks gestation ~ 1/3 above pubic bone
16 weeks gestation ~ 2/3 above pubic bone
20 weeks pregnant ~ higher than the belly button
24 weeks ~ 1/4 of the top of the abdomen above the navel
32 weeks ~ 2/4 pregnancy peak on the belly button
36 weeks ~ 3/4 of the abdomen on the belly button
Based on ovulation
The calculation of gestational age based on ovulation usually applies only to those who have regular menstrual period and remember the exact date of having sex. However, for those of you who have irregular periods, determining the exact date of ovulation is extremely difficult. Whereas the calculation of ovulation days is based on the menstrual period of the next cycle (the 14th day before the next period), while the next cycle does not occur again due to successful conception.
So this method often produces results with low accuracy.
Calculate the due date for pregnancy
Simple pregnancy calculation formula
In addition to calculating the gestational age, mothers can rely on the formula to calculate their own due date. Accordingly, the due date will be calculated according to two righteous works, namely:
The first day of your last period + 9 months + 7 days
For example: The first day of the last period is 3/3/2020, the due date will be calculated 3 + 7 = 10, birth month: 3 + 9 = 12. The result is 10/12/2020.
The first day of your last period - 3 months + 7 days
For example: The first day of the last period is 3/3/2020, the due date will be calculated from 3 + 7 = 10, the month of birth will be delayed 3 months as February, January and December.
Hopefully this article has provided the necessary knowledge to help mothers can easily calculate the age of the fetus. However, to get the most accurate results, she elected. . Dịch vụ: Thiết kế website, quảng cáo google, đăng ký website bộ công thương uy tín
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