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9 Non-Stress Test Report
NST Reassurance Criteria
The patient is monitored for a user-definable period of time (10 - 60 minutes in steps of 5 minutes).
The test is considered reassuring when the following criteria are met:
•
The fetal heart rate is valid at least 90% (this is configurable) of the specified time span.
•
The FHR features a user-defined minimum number of accelerations.
•
The FHR features a user-defined maximum number of tolerated decelerations, and does not
include severe or prolonged decelerations, which are never tolerated.
•
The average baseline fetal heart rate lies within the user-defined limits for low heart rate and high
heart rate over the whole time span.
•
The FHR exhibits a moderate variability (user-defined) for the specified time span.
An NST Report is generated when the reassuring criteria are met the first time in the current
monitoring phase. When performing NST with twins or triplets, a separate NST Report is generated
for each fetus.
In the printed report, the average short term variability (STV) value is shown in bpm and ms. This is
not part of the reassurance criteria.
After the reassurance criteria have been met, the clinician can print the NST Report and then turn the
fetal monitor off, or may continue fetal monitoring and print the report at any time.
Non-Reassuring Report
When the reassurance criteria are NOT met if the test has run for 90 minutes, or if you stop anytime
during the 90 minute period, then the test is stopped and a report is generated, stating the reassurance
criteria have not been met.
Non-Reactive NST Test
If a non-reactive test occurs and you then use acoustic stimulation, you must exercise caution in
interpreting the resulting traces, as artificial stimulation is not taken into account when calculating test
results.
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