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Non-stress antenatal cardiotocography in high risk pregnancy.

A prospective study of 127 high risk patients who had a non-stress cardiotocographic test within 7 days of the onset of labour demonstrated a 50% false positive rate in the 14 patients with abnormal tests. The corrected false negative rate in the patients with normal tests within 7 days of labour was 0.9% if stillbirth was chosen as the end-point assessed, but 10.4% if this end-point was an indicator of fetal or neonatal morbidity.