Which scenario indicates a completely normal result for a contraction stress test?

In the context of a contraction stress test (CST), a completely normal result is characterized by specific patterns in fetal heart rate response to contractions. The correct scenario, where there are no late or variable decelerations regardless of the frequency of contractions, indicates that the fetus is handling the stress of contractions well and is receiving adequate oxygenation.

Late decelerations often indicate fetal distress related to uteroplacental insufficiency, which is a concerning sign. Variable decelerations can result from umbilical cord compression, and their presence during contractions suggests that the fetus may not be tolerating the contractions well. Early decelerations, while they can occur in a normal scenario, often reflect head compression during labor rather than a sign of fetal distress.

Therefore, a) reflects a situation where the fetal heart rate remains stable and reassuring throughout the test, indicating a healthy response to the stress of contractions. This is the hallmark of a normal CST, suggesting that the fetus is well-oxygenated and the placenta is functioning adequately.