Review Non-Stress Test (NST)

Prenatal Diagnostic Tests And Procedures > Maternal & Newborn

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Non-Stress Test (NST)

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Total Questions : 5

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Question 1:

A nurse is performing a non-stress test on a pregnant client.

What does a reactive NST indicate?

A. Adequate fetal oxygenation and normal fetal neurological function. B. Inadequate fetal oxygenation and normal fetal neurological function. C. Adequate fetal oxygenation and abnormal fetal neurological function. D. Inadequate fetal oxygenation and abnormal fetal neurological function.

Answer and Explanation

Choice A:

A reactive NST indicates adequate fetal oxygenation and normal fetal neurological function. This means that the baby’s heart rate increases when it moves, which is a sign of health and well-being.

Choice B:

Inadequate fetal oxygenation means that the baby is not getting enough oxygen, which can cause complications and distress.

Choice C:

Abnormal fetal neurological function means that the baby’s brain is not functioning properly, which can affect its development and survival.

Choice D:

Both inadequate fetal oxygenation and abnormal fetal neurological function are serious problems that require immediate medical attention.

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Question 2:

A nurse is performing a non-stress test on a pregnant client.

What does a nonreactive NST indicate?

Answer and Explanation

Choice A:

Adequate fetal oxygenation and normal fetal neurological function would result in a reactive NST, which shows at least two accelerations of the fetal heart rate within 20 minutes.

Choice B:

Inadequate fetal oxygenation and normal fetal neurological function would still cause some accelerations of the fetal heart rate, but not enough to be considered reactive.

Choice C:

Adequate fetal oxygenation and abnormal fetal neurological function would not affect the fetal heart rate response to movement or contractions unless the abnormality is severe.

Choice D:

Inadequate fetal oxygenation and abnormal fetal neurological function. A nonreactive NST shows no increase in the fetal heart rate (no accelerations) in response to fetal movement or contractions. This may indicate that the fetus is not getting enough oxygen or has a problem with its nervous system.

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Question 3:

A nurse is performing a nonstress test on a pregnant client who is at 32 weeks’ gestation and has diabetes mellitus type I.

Which finding indicates that the test is reactive?

A. Fetal heart rate (FHR) increases by at least 15 beats/min for at least 15 seconds twice or more in a 20-minute period B. FHR decreases by at least 15 beats/min for at least 15 seconds twice or more in a 20-minute period C. FHR remains stable throughout the test D. FHR increases by less than 10 beats/min for less than 10 seconds twice or more in a 20-minute period.

Answer and Explanation

Choice A:

Fetal heart rate (FHR) increases by at least 15 beats/min for at least 15 seconds twice or more in a 20-minute period. This indicates that the test is reactive, which means the baby is healthy and getting enough oxygen.

Choice B:

FHR decreases by at least 15 beats/min for at least 15 seconds twice or more in a 20-minute period. This indicates a deceleration, which may be a sign of fetal distress.

Choice C:

FHR remains stable throughout the test. This indicates that the test is nonreactive, which means the baby’s heartbeat didn’t change when moving, or the baby wasn’t moving much. A

Choice D:

FHR increases by less than 10 beats/min for less than 10 seconds twice or more in a 20-minute period. This indicates that the test is nonreactive, which means the baby’s heart rate did not increase enough to meet the criteria for a reactive test.

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Question 4:

A pregnant client asks the nurse how long the Non-Stress Test (NST) is usually performed.

How should the nurse respond ?

A. The NST is usually done for 20 to 40 minutes or until at least two fetal movements are recorded. B. The NST is usually performed after 28 weeks of gestation or earlier if there are risk factors. C. The NST requires placing two belts with sensors on the client's abdomen. D. The NST is interpreted as reactive or nonreactive.

Answer and Explanation

Choice A:

The NST is usually done for 20 to 40 minutes or until at least two fetal movements are recorded. This is because the NST monitors the fetal heart rate in response to fetal movement, in order to assess fetal well-being. A reactive test indicates that the fetal heart rate accelerates by 15 bpm above the baseline and lasts for 15 to 30 seconds in association with fetal movement.

Choice B:

It does not answer the question of how long the NST is usually performed. It only states when the NST is usually performed, which is after 28 weeks of gestation or earlier if there are risk factors.

Choice C:

It does not answer the question of how long the NST is usually performed. It only describes how the NST is performed, which is by placing two belts with sensors on the client’s abdomen.

Choice D:

It does not answer the question of how long the NST is usually performed. It only explains how the NST is interpreted, which is as reactive or nonreactive.

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Question 5:

During a Non-Stress Test (NST), the fetal heart rate (FHR) increases by at least 15 beats per minute for at least 15 seconds twice or more in a 20-minute period.

How should the nurse interpret this finding?

A. A reactive NST indicates adequate fetal oxygenation and normal fetal neurological function. B. A nonreactive NST requires further evaluation such as a biophysical profile (BPP) or a contraction stress test (CST). C. NST has no risks or complications for the pregnant person or the fetus. D. NST is a prenatal screening test that measures the FHR in response to fetal movements.

Answer and Explanation

Choice A:

A reactive NST indicates adequate fetal oxygenation and normal fetal neurological function. This means that the fetal heart rate increases by at least 15 beats per minute for at least 15 seconds twice or more in a 20-minute period. This is a sign of a healthy and active fetus.

Choice B:

A nonreactive NST does not necessarily mean that there is a problem with the fetus. It could mean that the fetus is asleep, not moving enough, or has a medication effect. A nonreactive NST requires further evaluation such as a biophysical profile (BPP) or a contraction stress test (CST) to confirm fetal well-being.

Choice C:

NST has some risks and complications for the pregnant person or the fetus. For example, NST may cause anxiety, false-positive results, or unnecessary interventions if the test is not interpreted correctly.

Choice D:

NST is not a prenatal screening test that measures the FHR in response to fetal movements. NST is a prenatal diagnostic test that measures the FHR in response to uterine contractions.

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Non-Stress Test (NST)

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