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HOW MANY WEEKS IS A PREGNANCY

This is how to calculate gestational age


HOW MANY WEEKS IS A PREGNANCY - Some women may not know how to calculate gestational age. Although it is difficult to determine accurately because the exact time of conception is unknown, gestational age can be estimated in several ways.

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HOW MANY WEEKS IS A PREGNANCY


To calculate gestational age, the method that is widely used today is the date of the last menstrual period. The first day of the last menstrual period (LMP) is considered the first day of gestation.

Usually, a woman will go through about 280 days or 40 weeks of pregnancy from HPHT. The assumption that HPHT is the first day of pregnancy is still considered quite accurate, although fertilization usually begins to occur around 11-21 days after that date.

This is how to calculate gestational age

Knowing the gestational age is very important to estimate the time of birth of the baby. When the due date (HPL) has been determined, the baby's due date is between two weeks before and two weeks after the HPL.

To find out how to calculate gestational age, the following steps can be taken:

Based on the first day of the last menstrual period (LMP)


A popular way to calculate gestational age is to determine the date of your last menstrual period before becoming pregnant. This method is known as the Naegele formula. This method is considered the best method for women who have a regular 28-day menstrual cycle.

First, determine the HPHT date in advance. Then, add 40 weeks from that date to determine the approximate day of delivery. This is based on the assumption that pregnancy is usually lived for 9 months or 40 weeks or 280 days. By knowing the estimated date of birth of the baby, the gestational age can be known.

The following is the calculation simulation:

• Determine the first day of the last menstrual period (LMP)
• Add a year
• Add seven days
• Move back three months

For example, if the HPHT is July 22, 2022, the calculation will be:

• 22 July 2022 + 1 year = 22 July 2023
• July 22, 2023 + 7 days = July 29, 2023
• 29 July 2023 - 3 months = 29 April 2023

Based on this formula, the interpretation of the baby's birth day is April 29, 2023.

Although easy and fairly accurate, this method cannot be applied to women who do not remember when their HPHT was or who have irregular menstrual cycles.

Based on ultrasound


In situations where the above method is considered not to give accurate results, for example if your period is irregular, you can visit a doctor to determine the gestational age. The obstetrician will perform a physical examination and a transvaginal ultrasound to determine gestational age more accurately.

Ultrasound results in calculating gestational age will be more accurate if done in the early stages of pregnancy. This is because in the first few weeks, the fetus tends to develop at the same rate.

However, as gestational age increases, the rate of fetal growth can vary. Growth can be fast in certain months, then slow down in the following months. Therefore, ultrasound examinations performed in the last trimester of pregnancy are not intended to determine the age of the fetus, but to monitor whether the fetus is growing well.

Calculating gestational age is important to estimate the time of birth of the baby. The most commonly used methods are HPHT calculations and ultrasound examinations. However, the results of the two may not be the same, because each method has different conditions for obtaining accurate results.

However, don't worry, the obstetrician will continue to monitor your pregnancy and let you know when your little one is about to be born. That is why, regular pregnancy check-ups to the obstetrician need to be done.

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  • after how many weeks is a pregnancy test accurate,
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  • at how many weeks is a pregnancy viable,
  • how many weeks is a pregnancy established,
  • how many weeks is a pregnancy test,
  • how many weeks is a pregnancy from ovulation,
  • how many weeks is a pregnancy trimester,

 

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