Cara Menghitung TBJ Janin

>Hello Sohib EditorOnline! In this journal article, we will discuss about how to calculate the fetal weight or TBJ (Tinggi Badan Janin) during pregnancy. Expectant mothers always curious to know their unborn baby’s approximate weight or height, and this information is vital for the health of both mother and baby.

What is TBJ Janin?

Tinggi Badan Janin (TBJ) is the measurement that indicates the length of the fetus from its head (vertex) to its heel bone (calcaneus). The measurement of TBJ determines the fetal weight, and it is estimated to a certain degree of accuracy. This measurement is usually taken from the second trimester onwards in pregnancy.

Why is TBJ Janin Important?

Estimating fetal weight or TBJ is essential to anticipate delivery complications, especially with mothers who have a high-risk pregnancy. It helps doctors and midwives to predict whether the baby can be delivered vaginally or if the mother needs to undergo a cesarean section to prevent any complications or risks.

TBJ Janin also helps determine if the fetus is growing correctly for its gestational age. Doctors and midwives can monitor growth and development and intervene if necessary, such as if the fetus is too small or too large for its gestational age.

As an expectant mother, knowing your baby’s estimated weight and growth development can help you prepare for childbirth.

How to Calculate TBJ Janin?

Several methods can be used to calculate TBJ Janin, depending on the resources available in the healthcare facility where you attend your antenatal appointments.

Ultrasound Method

The most accurate method of calculating TBJ Janin is using ultrasound. An ultrasound scan is a non-invasive way of visualizing the fetus inside the mother’s womb. The echo generated by the fetus allows healthcare professionals to measure the distance between its head and heel bone.

The measurement of the TBJ Janin is taken in millimeters (mm) and then converted into centimeters (cm).

Fundal Height Measurement Method

The fundal height measurement method is an indirect way of calculating TBJ Janin. This method involves measuring the distance between the pubic bone and the top of the uterus. The measurement is taken with a tape measure and is recorded in centimeters.

The measurement of the fundal height corresponds to the gestational age of the fetus. The average fundal height in centimeters roughly corresponds to the number of weeks of pregnancy. For instance, at 28 weeks of gestation, the average fundal height measurement would be around 28 cm.

Johnson’s Formula Method

Johnson’s Formula is an estimation method of calculating TBJ Janin, which uses a mathematical formula. This formula is based on the gestational age of the fetus, mother’s weight, and height, as well as the circumference of the mother’s abdomen.

The formula is:

TBJ Janin (in cm)	=	1.07 x (Mother’s Height in cm) + 0.55 x (Abdominal Circumference in cm) – 18.2 x (Fetal Age in Weeks) + 3.8

Shepard’s Formula Method

Shepard’s Formula is another estimation method of calculating TBJ Janin. This formula takes into account the gestational age of the fetus and the biparietal diameter (BPD), which is the distance between the two sides of the fetal head.

The formula is:

TBJ Janin (in g) – 1.75 x (BPD)2 + 83.6 x BPD + 49

Factors That Affect TBJ Janin Calculation

Many factors can affect the accuracy of TBJ Janin calculation, such as:

Amniotic Fluid Volume

The amount of amniotic fluid can affect the accuracy of TBJ Janin calculation. If there is too little amniotic fluid, the fetus may appear smaller, and if there is too much amniotic fluid, the fetus may appear larger than it is.

Position of the Fetus

The position of the fetus can also affect the accuracy of TBJ Janin calculation. If the fetus is not in a good position, such as breech or transverse, it may be difficult to take an accurate measurement.

Mother’s Weight and Height

The mother’s weight and height are essential factors that can affect TBJ Janin calculation. A mother who is overweight may have difficulty obtaining an accurate measurement due to the additional layers of tissue. A mother who is shorter may have a smaller uterine cavity, which can affect the measurement of the TBJ Janin.

Gestational Age of the Fetus

The age of the fetus is another critical factor that can affect TBJ Janin calculation. The earlier the measurement is taken in pregnancy, the less reliable it may be. The later the measurement, the more accurate it may be.

FAQs

1. Can TBJ Janin be Measured at Home?

No, TBJ Janin cannot be measured at home because it requires specialized equipment, such as ultrasound, which can only be performed by a skilled healthcare professional.

2. Is TBJ Janin Calculation Painful?

No, TBJ Janin calculation is not painful, but it can be uncomfortable for some expectant mothers, particularly when taking an ultrasound scan. However, most expectant mothers find the experience worthwhile since it provides necessary information about the well-being of their unborn baby.

3. Is there a Risk of Miscarriage or Harm to the Fetus during TBJ Janin Calculation?

No, there is no risk of miscarriage or harm to the fetus during TBJ Janin calculation since it is a non-invasive procedure. However, it is essential to follow the standard safety protocols for ultrasound procedures during pregnancy.

4. Can TBJ Janin Calculation Predict the Gender of the Baby?

No, TBJ Janin calculation cannot predict the gender of the baby because it is solely based on the measurement of the fetal length.

5. When is the Best Time to Perform TBJ Janin Calculation?

The best time to perform TBJ Janin calculation is usually during the second trimester of pregnancy, between 20 and 24 weeks. However, it can also be performed later in pregnancy if necessary.

Conclusion

Congratulations Sohib EditorOnline for reaching the end of this journal article! TBJ Janin calculation is a crucial aspect of antenatal care that provides essential information about the growth and development of the unborn baby. It is an accurate way to estimate fetal weight and measure fetal growth, which can help healthcare professionals predict any complications during childbirth. It is essential to follow your healthcare provider’s guidance and attend all your antenatal appointments to ensure the health of both you and your unborn baby.

Cara Menghitung TBJ Janin