The Size Of The Fetal Head Is Larger Than The Estimated Gestational Age?

Illustration of The Size Of The Fetal Head Is Larger Than The Estimated Gestational Age?
Illustration: The Size Of The Fetal Head Is Larger Than The Estimated Gestational Age? cdc.gov

In the afternoon, I just returned home from the doctor to confirm my obstetrical age, which I feel is over 16 weeks. But when finished on ultrasound, the doctor said if the age of my fetus is still 14w5d. Then the doctor also checked the size of my fetus’s head, the doctor said if the size of my fetus’s head, the size of the fetus is 17w3d. Body size smaller than the head. Is that okay? So what exactly is the exact age of my fetus? Thanks before.

1 Answer:

Hello R Rain,

Ultrasonography is a medical examination that uses high-frequency sound waves to get a picture of organs in the body. During pregnancy, ultrasonography is useful for the following:

 Pregnancy Confirmation Determine the location of the fetus inside the uterus or outside the uterus Determine the number of the fetus Determine the location of the placenta See and listen to the fetal heart rate Assess the quality and quantity of amniotic water Measure anthropometry of gestational sacs or fetuses that can be converted by the instrument into predicting fetal age and also the estimated date of delivery Diameter gestational sac Length of head to tail bone Fetal head diameter Fetal abdominal circumference Length of fetal thigh bone Detects several abnormalities in the fetus Detects abnormalities in the reproductive organs: for example cysts, uterine myomas There is a possibility of differences in the results of gestational age based on ultrasonography with gestational age based on HPHT (menstruation first menstruation last) around 1-2 weeks and it is still normal. Generally the best time to do ultrasonography to determine gestational age is between 13-15 weeks. Ultrasonography performed at 32 weeks gestation is generally inaccurate in determining the gestational age due to the size of the fetus's head that is already so large (not completely captured by the examination instrument) and the field of examination is reduced because some of the fetus's head has descended to the pelvic door.

Ultrasonography is an examination that is very dependent on the operator - the results of one operator who do not necessarily exactly the same as other operators. Results of fetal estimation based on ultrasound that are different from HPHT (smaller fetal age on ultrasound) can arise because:

 Normal 1-2 week difference Low fetal weight than the fetal weight should be at that age (fetal growth restriction) Estimated fetal age based on different head and stomach sizes can be caused by:

 Variation of examination - baby's position prevents the operator and ultrasound device from capturing images correctly Macrocephaly - head size larger than the fetus Disorders such as hydrocephalus - need periodic evaluations to monitor the increase in head size, and there are typical signs of hydrocephalus obtained from head examination the fetus on ultrasound, additional examinations such as MRI Both based on HPHT, ultrasound, height of the uterine fundus, gestational age obtained is "estimated" or estimated so that there are still deviations of age such as 1-2 weeks and not have to worry about. If the regular menstrual cycle estimates of pregnancy using HPHT can be used. Ultrasound results can also be used if done at the right gestational age, if control is 4 weeks later, gestational age on ultrasound (if fetal growth is normal) should increase by 4 weeks too, but if fetal growth is abnormal (too small or large), the estimated results the age of the fetus may not exceed or be less than the age based on HPHT. Thus the explanation from me, hopefully useful.

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