What is a negative contraction stress test?

A negative contraction stress test indicates that there are no late or significant variable decelerations observed during the test. This result is important because it suggests that the fetus is capable of maintaining an adequate heart rate response during uterine contractions, which is a sign of good fetal well-being. The absence of late decelerations is particularly reassuring as it suggests that the placenta is functioning adequately, and the fetus is not experiencing distress during the stress of contractions. In this context, the presence of significant variable decelerations or late decelerations would indicate potential fetal compromise, thus rendering those conditions as undesirable outcomes on the contraction stress test. An irregular heart rate pattern would also not align with the criteria for a negative test, as it lacks the stability and predictability required for reassuring fetal status.