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From the UWorld quesiton:
In patients with a late-/post-term pregnancy and oligohydramnios on ultrasound or an abnormal nonstress test, immediate delivery is indicated due to the risk of intrauterine fetal demise.
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Late-/post-term pregnancies are at increased risk for uteroplacental insufficiency and intrauterine fetal demise. Therefore, these patients undergo routine fetal monitoring with a nonstress test and amniotic fluid volume. Patients with oligohydramnios, a marker for placental insufficiency, require immediate delivery.
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