Is a reactive nonstress test considered positive or negative?

Is a reactive nonstress test considered positive or negative?

• A. Negative
• B. Equivocal
• C. Positive
• D. Inconclusive

Answer: (C)

Interpreting fetal heart rate patterns during the nonstress test centers on accelerations in response to fetal movement. A reactive NST shows two or more accelerations within about 20 minutes, with each acceleration at least 15 beats per minute above baseline and lasting at least 15 seconds (gestational-age adjustments apply for preterm). This pattern indicates the fetus is getting enough oxygen and has a functioning autonomic nervous system, which is reassuring. Because this finding signals well-being, it’s described as positive (reassuring). If the test doesn’t show these accelerations, it’s nonreactive, and additional evaluation—such as vibroacoustic stimulation or further testing like a contraction stress test or biophysical profile—would be considered.

Interpreting fetal heart rate patterns during the nonstress test centers on accelerations in response to fetal movement. A reactive NST shows two or more accelerations within about 20 minutes, with each acceleration at least 15 beats per minute above baseline and lasting at least 15 seconds (gestational-age adjustments apply for preterm). This pattern indicates the fetus is getting enough oxygen and has a functioning autonomic nervous system, which is reassuring. Because this finding signals well-being, it’s described as positive (reassuring). If the test doesn’t show these accelerations, it’s nonreactive, and additional evaluation—such as vibroacoustic stimulation or further testing like a contraction stress test or biophysical profile—would be considered.