Which factor serves as a clinical indicator for a third trimester amniocentesis?
a. Sex of the fetus
b. Rh isoimmunization
c. Placenta previa
d. Placental abruption
ANS: B
Rh isoimmunization is a clinical indicator for a third-trimester amniocentesis. Although an amniocentesis can determine the sex of the fetus, this is not a primary indication for a third-trimester amniocentesis. Ultrasound imaging would be indicated for evaluation of placenta previa. Ultrasound imaging would be indicated for evaluation of placental abruption.
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