What should the nurse explain about the nonstress test procedure to the client?

The nonstress test (NST) is a key assessment tool used to monitor fetal well-being, primarily focusing on fetal heart rate patterns. The correct answer emphasizes that an ultrasound transducer is used to record fetal heart activity. During this procedure, the transducer is placed on the mother’s abdomen, and it detects the heart rate of the fetus in real-time. Healthcare providers look for reactive patterns which indicate that the fetus is receiving enough oxygen and is healthy.

When the baby's heart rate increases in response to fetal movement, it suggests a well-functioning nervous system and adequate oxygen supply. This test is noninvasive and helps in assessing the health of the fetus, particularly in high-risk pregnancies.

The other options do not accurately describe the nonstress test. While it does not assess uterine contractions, maternal blood pressure, or directly monitor fetal movement in relation to activities, it focuses primarily on the relationship between fetal heart rate and fetal movements, providing valuable information about the baby's condition.