If FHR decelerations occur with contractions more frequently than every 2 minutes during a CST, this is termed:

In the context of a contraction stress test (CST), the correct terminology is crucial for interpreting fetal heart rate (FHR) patterns in relation to uterine contractions. If FHR decelerations occur with contractions more frequently than every 2 minutes, this indicates that the fetus is experiencing stress more often than can be assessed adequately or safely during the test. This situation necessitates careful interpretation and can lead to concerns about the fetal condition.

A positive CST is characterized by the presence of decelerations that coincide with contractions, suggesting a potential compromise in fetal oxygenation. An unsatisfactory CST indicates that the results cannot be interpreted due to insufficient data, often caused by an inadequate number of contractions during the testing period. A negative CST shows no decelerations with contractions, indicating a reassuring fetal status.

The term "equivocal CST" describes a scenario in which the data obtained from the test do not yield a definitive interpretation, which is exactly what happens when decelerations occur too frequently. This increased frequency can obscure the ability to determine the relationship between FHR and contractions clearly, placing it in the equivocal category where further assessment and monitoring are warranted.