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Fetal biometry is a test that measures the size of a fetus during pregnancy using ultrasound. It consists of several measurements that tell your pregnancy care provider how the fetus is growing for its gestational age and if there are signs of growth problems.
Main fetal measurements: what should be measured, when and how? Individuals performing ultrasound scans and fetal biometric measurements on a routine basis should have specialized training in the practice of diagnostic obstetric ultrasound, including training in ultrasound safety.
These measurements may be useful in assessing certain syndromes, potential karyotype abnormalities, severe growth restriction, or in assessing fetal age when other measurements are difficult to obtain.
Ultrasound findings are frequently best interpreted in combination with quantitative maternal serum hCG (human chorionic gonadotropin) with or without progesterone levels. Serial examinations may be needed to reach a diagnosis.
Fetal ultrasonography is a standard and vital component of a comprehensive fetal evaluation in pregnancy. There are specific indications for using ultrasound in each trimester and assessing both the fetus and the mother by ultrasonography.
Some measurements of fetal size should be included in the formal report of each examination. The minimum measurements to report are: biparietal diameter (BPD), head circumference (HC), abdominal circumference (AC), and femur length (FL). 5 – 7 Other biometry which could be reported include: humerus length (HL), nasal bone length (NB), nuchal ...
Poster based on the ISUOG practice guidelines for performance of the routine mid-trimester fetal ultrasound scan. ISUOG clinical Standards committee.
Head measurements can help determine the age of a fetus. Open hand and fingers, as shown below, are among the signs that a health care team looks for on an ultrasound to confirm that a fetus is growing and developing as expected. This image shows the lens of the eye.
Learn about biparietal diameter (BPD), a measurement that is useful in dating a pregnancy and estimating fetal weight after about 13 weeks. What Does BPD Mean On an Ultrasound? How Is BPD...
The American College of Obstetricians and Gynecologists (ACOG) and the Society of Obstetricians and Gynaecologists of Canada recommend ultrasound measurement of the crown rump length (CRL) of the embryo or fetus as the most accurate method to establish or confirm gestational age [21,22].