Final answer:
A contraction stress test (CST) result is considered positive when the fetal heart rate shows late decelerations during contractions.
Step-by-step explanation:
A contraction stress test (CST) is a test used to assess the well-being of the fetus during contractions. The test measures the fetal heart rate in response to uterine contractions. A positive CST result is indicated by the presence of late decelerations, which are a decrease in the fetal heart rate that occurs after the contraction has reached its peak.
Learn more about Contraction stress test