Fetal Growth Restriction – USMLE Step 2 CK exam

by / Wednesday, 30 June 2010 / Published in OB/GYN

Symmetrical:

The insult to growth occurs before 28 weeks gestations, and growth of both the head and body is deficient.  This is most commonly due to genetic anomalies or early congenital infections (ToRCH infections)

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Asymmetric:

From insult after 28 weeks gestation, characterized by normal head size and reduced abdominal circumference.

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FGR is suspect when fundal height is at least 3cm less than the actual gestational age in weeks.  Confirmation of FGR is made with an ultrasound.

*** Cigarette smoking is the most common preventable cause of fetal growth restriction in the USA

***Abdominal circumference is the most effective parameter for estimation of fetal weight in cases of FGR

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