What is indicated by a negative CST result?

A negative contraction stress test (CST) indicates that there are no late or significant variable decelerations observed during contractions. This result suggests that the fetus is likely tolerant to the stress of labor, which is a reassuring sign of fetal well-being.

In a negative CST, the contractions induced during the test do not lead to any concerning decelerations in the fetal heart rate (FHR), particularly those that would indicate fetal distress. The absence of late decelerations means that the fetal heart rate response is stable and suggests that the baby is receiving adequate oxygenation even during periods of increased uterine activity.

This context indicates a healthy intrauterine environment, minimizing the likelihood of fetal compromise during labor. Consequently, the result can guide clinical decisions about the timing and necessity of delivery if labor is to be induced or if the patient is in labor.

The other options do not correctly reflect the implications of a negative CST: the presence of late decelerations (as noted in the first option) would be a positive result indicating possible fetal distress, while infrequent decelerations and baseline FHR variations do not directly pertain to the reassuring status suggested by a negative CST.