Non-Stress Test (NST) vs. Biophysical Profile (BPP)

Both the Non-Stress Test (NST) and the Biophysical Profile (BPP) are fetal surveillanc e tests used in pregnancy to assess fetal well-being, especially in high-risk pregnancies. However, they differ in their components, method of assessment, and diagnostic value . 1. Non-Stress Test (NST) Definition The NST is a non-invasive test that monitors the fetal heart rate (FHR) in response to fetal movements. It helps assess oxygenation and autonomic nervous system function without inducing contractions. Components Fetal heart rate (FHR) pattern: Measured via an external Doppler transducer. Fetal movement: Mother reports fetal kicks during monitoring. Reactivity: A normal fetus should show acceleration of heart rate with movement. Interpretation Reactive NST (Normal): At least 2 accelerations of FHR (≥15 bpm above baseline lasting ≥15 sec) within 20 minutes. Indicates adequate oxygenation and neurological function. Non-Reactive NST (Abnormal): No significant FHR accelerations in 40 minut...