How to Have a Contraction Stress Test

During a pregnancy, a physician may order a contraction stress test. A contraction stress test is usually done at 34 weeks of pregnancy or later by a doctor in a medical office or a hospital. The contraction stress test is designed to see how a fetus deals with reduced oxygen levels during contractions. If you are going to have a contraction stress test, it's important to know how the test is done.

Instructions

Difficulty: Moderate

1. Fast for 4 to 8 hours before your contraction stress test. The doctor usually requires this just in case he has to deliver your baby in an emergency. Also, be sure to empty your bladder before the test starts.
2. Sign a consent form if your physician gives you one. Be sure to voice any questions or concerns that you may have for the physician at this time.
3. Get in the proper position for the contraction stress test. Usually, you lie on a bed with your back elevated somewhat. Sometimes, you will be instructed to lie on your left side. Two sensors will be placed on your stomach with belts. These sensors measure your contractions and the heart rate of the fetus.
4. Allow contractions to be started. Either the hormone oxytocin will be administered to you through an IV, or you will be instructed to stimulate your nipples. Both of these are known to start contractions in most women. Follow the instructions of your physician if you are told to do nipple stimulation. If oxytocin is used, the hormone will be administered until you have three contractions in a ten minute time span, each lasting 45 seconds or longer.
5. Stop nipple stimulation or oxytocin administration. You will be watched in the office or hospital until your contractions go away or return to what they were before the contraction stress test was started. This can take up to two hours.
6. Talk to your physician about the interpretation of the contraction stress test. If the heart rate of your fetus speeds up after the contractions, the test is said to be negative (the desired result). If the heart rate of your fetus shows repeated decelerations after contractions, the test is said to be positive. If you have a positive test result, talk to your physician about next steps.

Tips & Warnings

• A contraction stress test can also be referred to as a stress test or an oxytocin challenge test.
• There are some risks to having a contraction stress test. In some women, this test may start labor prematurely. It may start prolonged contractions even after the oxytocin administration has been stopped. If you have any concerns, speak to your physician.
• The information in this article is not meant to be a substitute for regular medical care or advice. Speak to your physician if you have any concerns about your pregnancy.