What is considered a reactive nonstress test (NST)?

A decrease in fetal heart rate during monitoring

The presence of at least two fetal heart rate accelerations during 20 minutes of monitoring

A rise in fetal heart rate of at least 15/min from baseline lasting for at least 15 seconds

The absence of fetal heart rate accelerations during monitoring

Answer and Explanation

The Correct Answer is B

A. A decrease in fetal heart rate during monitoring: A decrease in fetal heart rate (deceleration) is not a reassuring sign and suggests fetal distress, which is not considered reactive.

B. The presence of at least two fetal heart rate accelerations during 20 minutes of monitoring: A reactive NST is defined as at least two fetal heart rate accelerations of 15 beats per minute lasting at least 15 seconds within a 20-minute period, indicating fetal well-being.

C. A rise in fetal heart rate of at least 15/min from baseline lasting for at least 15 seconds: While this is part of the criteria for determining accelerations, the key aspect of a reactive NST is the presence of at least two such accelerations within a 20-minute period.

D. The absence of fetal heart rate accelerations during monitoring: The absence of accelerations in a 40-minute period is classified as a nonreactive NST, which may indicate fetal hypoxia or other concerns requiring further evaluation.

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Correct Answer is B

Explanation

A. "I should schedule the test when the baby is usually active." The test relies on fetal movements to assess heart rate responses, so scheduling it when the baby is active improves accuracy.

B. "I will have to lie on my back during the test." Lying on the back (supine) can cause supine hypotensive syndrome by compressing the inferior vena cava. The client should lie in a semi-Fowler’s or left lateral position.

C. "My baby's heart rate will be monitored during the test." The NST assesses fetal heart rate patterns in response to movement, so monitoring the fetal heart rate is essential.

D. "It will take 20 to 30 minutes to complete the test." An NST typically lasts 20-30 minutes unless additional monitoring is needed due to a nonreactive result.

A. This test assesses fetal lung maturity. B. This test identifies an Rh incompatibility between the mother and fetus. C. It assesses various markers of fetal well-being. D. It is a screening test for spinal defects in the fetus.

Correct Answer is D

Explanation

A. This test assesses fetal lung maturity. Fetal lung maturity is assessed using the lecithin-sphingomyelin (L/S) ratio or phosphatidylglycerol (PG) test, typically performed after 32 weeks of gestation.

B. This test identifies an Rh incompatibility between the mother and fetus. Rh incompatibility is detected through an indirect Coombs test, not an MSAFP test.

C. It assesses various markers of fetal well-being. The biophysical profile (BPP) and nonstress test (NST) assess fetal well-being, not MSAFP.

D. It is a screening test for spinal defects in the fetus. MSAFP is a screening test for neural tube defects (e.g., spina bifida, anencephaly) and chromosomal abnormalities. High levels may indicate neural tube defects, while low levels may suggest Down syndrome or other chromosomal abnormalities.

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What is considered a reactive nonstress test (NST)?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

A nurse is providing teaching to a client who is at 30 weeks of gestation and is to have a nonstress test (NST). Which of the following statements by the client indicates a need for further teaching?

Correct Answer is B

Explanation

A nurse is caring for a client who is scheduled for a maternal serum alpha-fetoprotein test at 15 weeks of gestation. The nurse provides which of the following explanations about this test to the client?

Correct Answer is D

Explanation

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