contraction stress test

contraction stress test
(CST) the monitoring of the response of the fetal heart rate to uterine contractions by cardiotocography; uterine contractions may be spontaneous or induced by maternal nipple stimulation or by intravenous infusion of oxytocin (oxytocin challenge test). A negative (normal) test consists of three contractions within a 10-minute period with no deceleration of the fetal heart rate; a late deceleration pattern may reflect fetal hypoxia.

Contraction stress test. The top tracing of each pair shows the fetal heart rate; the bottom shows uterine contractions. (A), A negative (normal) result, with uterine contractions followed by an unchanged fetal heart rate. (B), A positive result, showing late deceleration with uterine contractions.

Medical dictionary. 2011.

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