Contraction Stress Test

Oxytocin Challenge Test

What Affects the Test

Reasons you may not be able to have the test or why the results may not be helpful include:

• Past pregnancy problems, such as a cesarean section with a midline (vertical) incision, placenta previa, or placenta abruptio. The test also is not recommended if you are pregnant with more than one baby, are likely to have a premature rupture of the amniotic sac (membranes), have an incompetent cervix, or have been given magnesium sulfate in your pregnancy.
• A uterine surgery in the past. Strong contractions may cause the uterus to rupture.
• If you smoke or use cocaine.
• Movements of your baby during the test. It may be hard for the sensors to record your baby's heart rate or contractions.
• Being very overweight.
• Having a full bladder.

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Author:	Maria G. Essig, MS, ELS	Last Updated: February 22, 2008
Medical Review:	Kathleen Romito, MD - Family Medicine Liisa Honey, MD, FRCSC - Obstetrics and Gynecology
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