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 ?
TABLE 2 Evaluation of a Nonreactive Nonstress Test * Often a longer test duration, up to 90 minutes, is needed.
Minimum biweekly nonstress tests with biophysical profile as backup for nonreactive tests.
2] gel, six underwent oxytocin induction: four with prolonged rupture of membranes ([is greater than] 24 hours), one who had a Bishop score of 6 and pregnancy-induced hypertension, and one who was transferred to the university hospital because of a nonreactive nonstress test before the planned outpatient insertion of gel.
After 2 hours of ambulation, there was no dye on the tampon, and another nonstress test was reactive.
She must also be able to come to the office twice weekly for a nonstress test and a complete blood count, and once weekly for an ultrasound.
You can't rely on a nonstress test to help you decide if the fetus is sick or not.
If IUGR is suspected, fetal growth and status should be monitored weekly with a nonstress test and an amniotic fluid index.
A modified biophysical profile, which combines measurement of amniotic fluid volume with nonstress testing, is preferred because, unlike a nonstress test alone, it includes a chronic marker of fetal status: amniotic fluid volume.
DURING PRENATAL CARE, a woman underwent weekly nonstress tests due to excessive amniotic fluid until the level returned to normal.