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.
Fetal surveillance involves serial ultrasonographic evaluations for interval fetal growth and amniotic fluid volume, fetal monitoring through nonstress tests or biophysical profiles, and Doppler velocimetry of the umbilical arteries if intrauterine fetal growth restriction is present.