A nurse is reviewing the results of a nonstress test (NST) for a pregnant client at 32 weeks of gestation.
The nurse notes that the fetal heart rate (FHR) baseline is 140 bpm with moderate variability and two accelerations of 15 bpm lasting 15 seconds each in a 20-minute period.
How should the nurse interpret these findings?
A.
The NST is reactive, indicating fetal well-being
B.
The NST is nonreactive, indicating fetal compromise
C.
The NST is inconclusive, requiring further testing
D.
The NST is invalid, requiring a repeat test
The correct answer and Explanation is :
The correct answer is:
A. The NST is reactive, indicating fetal well-being.
Explanation:
A nonstress test (NST) is a common prenatal test used to assess fetal well-being by monitoring the fetal heart rate (FHR) in response to fetal movements. The NST measures how the fetal heart rate responds to its own movements and is considered “reactive” if it meets specific criteria, indicating that the fetus is well and not under distress.
Here’s a breakdown of the interpretation of the NST results provided:
- FHR Baseline: The baseline fetal heart rate is 140 bpm. This falls within the normal range of 110 to 160 bpm, which is reassuring.
- Moderate Variability: Variability refers to the fluctuations in the fetal heart rate from the baseline. Moderate variability, which is defined as 6 to 25 beats per minute (bpm) of fluctuation, is a positive sign as it indicates that the fetal autonomic nervous system is functioning properly.
- Accelerations: The NST report indicates two accelerations of 15 bpm lasting 15 seconds each within a 20-minute period. For the NST to be considered reactive, there should be at least two accelerations of 15 bpm above the baseline, lasting at least 15 seconds, within a 20-minute timeframe. These accelerations are indicative of fetal well-being and suggest that the fetus is receiving adequate oxygen and is not experiencing acute distress.
In summary, the presence of a normal baseline fetal heart rate, moderate variability, and the occurrence of two accelerations as described align with the criteria for a reactive NST. This finding generally indicates that the fetus is doing well and is not in immediate distress, suggesting good fetal oxygenation and well-being at the time of the test.
If the NST were nonreactive (Option B), it would suggest a need for further evaluation due to potential fetal compromise. An inconclusive test (Option C) would mean the results are not clear enough to determine fetal well-being and might require additional testing. An invalid result (Option D) would imply that the test needs to be repeated, but this does not apply to the current scenario as the NST findings meet the criteria for a reactive result.