Contraction Stress Test
Oxytocin Challenge Test
How It Is Done
A contraction stress test may be done in your doctor's office or hospital by a family medicine doctor or an obstetrician and a trained laboratory technician or nurse. You usually do not need to stay overnight.
During the test, you will lie on a bed with your back raised. You will be tilted a little to your left side so you will not have pressure on the blood vessels in your belly. Two belts with sensors will be placed around your belly. One belt holds the sensor that records your baby's heart rate; the other sensor measures your uterine contractions. Gel may be used on your skin with the heart rate sensors. The sensors are hooked to a recording unit. The heart rate monitor may be moved if your baby changes position. Your baby's heart rate and your contractions are recorded for 10 minutes. Your blood pressure and other vital signs are also recorded.
The hormone oxytocin is given in a low dose and increased until you have three contractions within 10 minutes, each one lasting longer than 45 seconds. Or you may be asked to massage one of your nipples by hand to start contractions. If you don't have a second contraction within 2 minutes of the first, you will massage your nipple again. If contractions do not occur within 15 minutes, you will stimulate both nipples.
After the test, you will be watched until your contractions go away or slow down to what they were before the test. A contraction stress test may take 2 hours.
 Go to previous section |  Go to top of page |  Go to next section |
| 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 | |
 | ||
| |
| Topic Contents | |
| Test Overview | |
| Why It Is Done | |
| How To Prepare | |
 | How It Is Done |
| How It Feels | |
| Risks | |
| Results | |
| What Affects the Test | |
| What To Think About | |
| References | |
| Credits | |