As the pregnancy progresses, the doctor will continue to check the fetal heart tones and will eventually schedule the mother for a non-stress test. The non-stress test (NST) monitors the fetal heart rate at the same time a toco transducer measures the mother's uterine contractions. Late in pregnancy, the uterus contracts – even though the mother cannot feel contractions – and the baby responds to these gentle contractions. The NST checks for a healthy fetal response to these contractions.

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