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The Abdominal Circumference (AC)

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ultrasound obstetric sonography obstetric ultrasound fetal ultrasound fetal biometry usg fetal measurements fetal abdominal circumference measurement abdominal circumference AC measurement AC measurement technique fetal AC ultrasound abdominal circumference ultrasound AC measurement errors fetal abdominal circumference errors abdominal circumference measurement mistakes ultrasound measurement technique AC measurement plane how to measure abdominal circumference

This module teaches students how to measure the AC effectively, a primary indicator of fetal nutrition and overall well-being. It focuses on identifying the correct abdominal plane, including the stomach bubble and portal vein, to monitor for growth restrictions.

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1. Which fetal biometric parameter is considered the most challenging to measure accurately?
BPD HC AC FL
2. The Abdominal Circumference primarily reflects the size of which fetal organ?
Spleen Stomach Kidneys Liver
3. The "Hockey Stick Sign" in fetal AC measurement refers to the sonographic appearance of which structure?
The aortic arch The continuous left and right portal veins The umbilical vein entering the liver The hepatic veins converging at the IVC
4. Which of the following is NOT one of the three criteria for a correct AC measurement plane?
Continuous left and right portal veins Symmetrical orientation of the lower ribs Shortest umbilical segment of the left portal vein Visualization of both fetal kidneys
5. During AC measurement, a lengthy section of the left portal vein is visible on the image. What does this indicate?
The transducer is tilted too cephalad The transducer is tilted too caudally/inferiorly The gain is set too high The fetus is in an unfavorable position
6. Why must excessive transducer pressure be avoided during fetal AC measurement?
It increases acoustic shadowing from ribs It compresses and distorts the fetal abdomen, producing a falsely small AC It elevates fetal heart rate, causing movement artifact It reduces ultrasound penetration depth
7. What is the primary anatomical landmark for measuring Abdominal Circumference (AC)?
Outer edge of the parietal bones Stomach, umbilical vein, and spine in a transverse plane Nasal bone and maxilla Outer perimeter of the fetal skull
8. The Abdominal Circumference (AC) is a reliable indicator of fetal nutrition and well-being.
True False
9. What condition might be suspected if the AC measurement is below the 10th percentile for gestational age?
Macrosomia Intrauterine Growth Restriction (IUGR) Polyhydramnios Microcephaly
10. Changes in AC measurements over time are critical for estimating fetal weight (EFW).
True False
11. Which of the following is NOT a common source of error when measuring AC?
Incorrect identification of anatomical landmarks Fetal position or movement Maternal factors like obesity Use of high-resolution ultrasound equipment
12. An abnormally large AC measurement may indicate fetal macrosomia.
True False