Contraction Stress Test (CST)
Contraction Stress Test (CST) ( 5 Questions)
A nurse is explaining the Contraction Stress Test (CST) to a pregnant client.
Which statement accurately describes a positive CST?
Late decelerations of the FHR with at least 50% of contractions. This indicates a positive CST, which means that the baby may be under stress and unable to tolerate labor contractions. A positive CST may require a cesarean section or further observation.
Choice B is wrong because late decelerations of the FHR with less than 50% of contractions indicate an equivocal CST, which means that the results are unclear and the test may need to be repeated.
Choice C is wrong because no late decelerations of the FHR during contractions indicate a negative CST, which means that the baby is healthy and can handle the stress of labor.
Choice D is wrong because variable decelerations of the FHR with or without contractions indicate cord compression, not placental insufficiency, which is what the CST is testing for.