Contraction stress test

A contraction stress test (CST) is performed near the end of pregnancyto determine how well the fetuswill cope with the contractionsof childbirth. The aim is to induce the contractions and monitor the baby to check for heart rateabnormalities. It involves the release of oxytocininto the blood stream of the pregnant woman by the stimulation of the nipples. The target is to achieve around three contractions every ten minutes.

An oxytocin challenge test (OCT) is sometimes performed afterwards, usually if the CST failed to give clear readings or the uterusdid not contract at an appropriate rate. This involves oxytocin being given to woman via an intravenous drip.

The test returns positive if there are noticeable decelerations of the heart rate during over half of the contractions.

History

The test was first introduced in 1972 and was standardised in 1975 when the parameters of contraction number and frequency were given.

Contraindications

This "stress test" is usually not performed if there are any signs of premature birthor placenta praevia.

See also

• Braxton Hicks

References

• von Almen, William F. "Antepartal Fetal Surveillance" at OBGYN.net. Accessed 1 August2005.

External links

• Oxytocin Challenge Testat iPaki.com

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It uses material from the Wikipedia article Contraction stress test.