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Essentials of Fetal Biometry

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Introduction to Fetal Biometry

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This introductory module defines fetal biometry and explores its fundamental role in prenatal care. Students will learn the core principles of using ultrasound to measure physical dimensions, understand the clinical importance of monitoring growth, and familiarize themselves with the essential guidelines and protocols for obtaining accurate measurements.

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1. What is the primary purpose of fetal biometry?
Detect chromosomal anomalies Measure fetal size & growth using ultrasound Assess placental location Screen for neural tube defects
2. Which two fetal growth abnormalities can biometry help detect?
Spina bifida & anencephaly IUGR & macrosomia Ventriculomegaly & microcephaly Oligohydramnios & polyhydramnios
3. What does Crown-Rump Length (CRL) measure?
Width of the fetal skull Length from crown of head to rump Circumference of the fetal abdomen Length of the femur
4. The Biparietal Diameter (BPD) measures which dimension of the fetal head?
Antero-posterior diameter Head circumference Width at the widest point Fronto-occipital length
5. How does Head Circumference (HC) compare to BPD in clinical utility?
HC is less reliable than BPD They measure identical parameters HC provides additional & more precise insight into fetal head growth HC replaces BPD entirely after 20 weeks
6. Which biometric parameter is most reflective of fetal nutritional status?
BPD FL HC AC
7. What does Femur Length (FL) primarily contribute to in fetal biometry?
Assessing fetal lung maturity Estimating fetal weight & aiding GA estimation Detecting skeletal dysplasia exclusively Measuring placental thickness
8. Which biometric measurement is the MOST accurate for estimating gestational age?
AC FL BPD CRL
9. Why do later biometric measurements (BPD, AC, FL) carry a higher margin of error for dating?
Equipment limitations in the second trimester Increased biological variability in fetal size as pregnancy progresses Measurements are taken at non-standardized planes These parameters do not correlate with gestational age
10. Across which period of pregnancy is biometric monitoring used to guide management?
First trimester only Second trimester only Third trimester only Throughout the entire pregnancy
11. Which of the following is the primary goal of fetal biometry in prenatal care?
To estimate the fetal heart rate To monitor fetal growth patterns and estimate gestational age To identify maternal complications To diagnose chromosomal abnormalities
12. Fetal biometry only includes measurements of fetal size, not fetal health.
True False
13. Which of the following parameters is used to monitor fetal head growth?
Abdominal Circumference (AC) Femur Length (FL) Crown-Rump Length (CRL) Biparietal Diameter (BPD) and Head Circumference (HC)
14. Accurate fetal biometry is only needed for high-risk pregnancies.
True False
15. Which of the following is a key guideline for obtaining accurate fetal biometric measurements?
Use the largest possible measurement for each parameter Ensure the ultrasound machine is calibrated for fetal imaging and use anatomical landmarks Limit the number of measurements to avoid unnecessary exposure Measure only once to save time
16. Reproducibility of measurements is not important as long as the first measurement appears accurate.
True False