USMLE Step 2 CK Lecture Notes 2019: Obstetrics/Gynecology (Kaplan Test Prep)

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BIOPHYSICAL PROFILE (BPP)


A complete BPP measures five components of fetal well-being: NST, amniotic
fluid volume, fetal gross body movements, fetal extremity tone, and fetal
breathing movements. The last four components are assessed using obstetric
ultrasound. Scores given for each component are 0 or 2, with maximum possible
score of 10 and minimum score of 0.


A modified BPP includes only the NST and amniotic fluid volume. Its
predictive value is almost as high as a complete BPP.


Score   of  8   or  10: highly  reassuring  of  fetal   well-being. Management  is  to
repeat the test weekly or as indicated. Fetal death rate is only 1 per 1,000 in
the next week.
Score of 4 or 6: worrisome. Management is delivery if the fetus is ≥36 weeks
or repeat the biophysical profile in 12–24 h if <36 weeks. An alternative is to
perform a CST.
Score of 0 or 2: highly predictive of fetal hypoxia with low probability of
false positive. Management is prompt delivery regardless of gestational age.
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