In prenatal care, what does a non-stress test assess?

A non-stress test (NST) is primarily designed to evaluate fetal well-being by monitoring the fetal heart rate in relation to movements. It involves the use of external monitors to track the heart rate and determine if there is an appropriate response when the fetus moves. A healthy fetus typically exhibits an increase in heart rate with movements, reflecting an adequate oxygen supply and good neurological health.

This test is particularly useful in high-risk pregnancies or if there are concerns about fetal distress. By measuring these responses, healthcare providers can gain insights into the fetal condition without inducing stress or requiring invasive procedures.

The other options provided do not align with the primary purpose of a non-stress test. Maternal blood pressure, contraction patterns, and amniotic fluid levels are assessed through different methods and tests tailored specifically for those concerns in prenatal care.