nonstress test


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Related to nonstress test: Biophysical profile, Contraction stress test

nonstress test

 (NST) [non-stres´]
evaluation of fetal well being during the intrauterine period. Observations of fetal heart rate response to fetal movements are made: a reactive pattern of more than 15 beats per minute above the baseline heart rate twice in 10 minutes is indicative of well being; a nonreactive pattern may indicate asphyxia, maternal medication, fetal anomalies, or a prolonged rest state. See also fetal monitoring.

non·stress test

a test to evaluate fetal well-being by evaluating fetal heart rate response to fetal movement; a reactive nonstress test is fetal heart rate acceleration in response to fetal movement.

nonstress test

(nŏn′strĕs′)
n.
An ultrasound examination of a fetus that measures fetal well-being by correlating fetal movement with changes in fetal heartbeat.

nonstress test (NST)

[non′stres]
an evaluation of the fetal heart rate response to natural contractile activity or to an increase in fetal activity. Also called fetal activity determination.

nonstress test

Obstetrics An indirect non-invasive monitor of the well-being of a fetus, where the frequency of fetal movement, degree of heart rate acceleration and beat-to-beat variation of the heart rate are monitored to determine the 'health' of the placental vasculature. See Deceleration, Montevideo units. Cf Fetal heart monitoring, Stress test.
References in periodicals archive ?
A modified biophysical profile is reassuring if the nonstress test shows at least two heart-rate accelerations during a 10-minute period, no significant decelerations, and an amniotic fluid index of more than 5.
Fetal surveillance is instituted in the form of daily fetal movement count, nonstress tests, and serial ultrasonographic evaluation of fetal growth and amniotic fluid volume to confirm fetal well-being.
Abnormal nonstress tests or amniotic fluid elevations should be followed by a comprehensive maternal and fetal evaluation, he advised.
By 32 weeks, weekly or twice-weekly nonstress tests or biophysical profiles are a good idea.
Here, the best (level I) evidence backs Doppler assessment, while other tests for decreased uteroplacental blood flow that are supported by level I or level II evidence include estimated fetal weight by ultrasound, amniotic fluid assessments, nonstress tests (NSTs), and fetal biophysical profiles (FBPs).