Nonstress Testing
Indications:
Any fetus at risk of hypoxia
Change in fetal movement as perceived by the patient
Chronic hypertension
Diabetes
Maternal thyroid disease
Previous stillbirth
Suspected IUGR
Oligohydramnios
Prolonged pregnancy
Fetal anomalies
Contraindications:
Gestational age <24 weeks
Interpretation:
>32 weeks
Reactive NST: two fetal heart rate accelerations within a 20-minute interval, peaking at least 15 beats per minute above the base line and lasting 15 seconds
<32 weeks
Reassuring for gestational age: two fetal heart rate accelerations 10 beats above the baseline and lasting for 10 seconds within a 20-minute interval.