9 Non-Stress Test Report
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 (if
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.
If the reassurance criteria are not met when 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
(*) Interpretation criteria based on guideline "NICHD 2008, v01"
User-defined criteria for CTG tracing:
valid FHR for 90% of reporting period
baseline heart rate between 120 bpm and 160 bpm
at least 2 accelerations in 10 min
not more than 1 decelerations
moderate baseline variability (6 - 25 bpm)
no severe or prolonged decelerations
no sinusoidal pattern in reporting period
). This is not part of the reassurance criteria.