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If the baby does not have a reactive NST, your doctor may order a CST. 
A mild solution containing pitocin, a medication that causes contractions, is given IV to Mom. A fetal monitor is placed on the uterus. The amount of solution given is increased until contractions are every three minutes. The effect of the contractions on the baby's heart rate is observed. There are three possible results. A reactive negative test shows accelerations of the baby's heart rate. With this result, the test may be repeated in one week. A nonreactive negative result is one in which no accelerations are seen, but no decelerations (a decrease in heart rate) are seen either. The test should be repeated in twenty-four hours if this result is obtained. A nonreactive positive test shows decelerations related to the contractions. With this result, your doctor may do a biophysical profile or elect to deliver the baby. However, since there is a high rate of false positive results with this test, most doctors do a biophysical profile.

ADDITIONAL RESOURCES THAT MAY HELP:
Stress Tests Explained
A Guide to Stress Tests
Defining a Stress Test
Monitoring the Baby's Health
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