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

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.
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.
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 5.0 cm.
Serial ultrasonography showed normal growth and amniotic fluid index with persistent 8/8 biophysical profiles and category 1 tracings on nonstress tests indicating reassuring fetal status.
Redman, "A computer system for the numerical analysis of nonstress tests," The American Journal of Obstetrics and Gynecology, vol.
SAN FRANCISCO -- Results of nonstress tests in 112 pregnant women being treated for chronic hypertension from January 2003 to September 2007 did not differ significantly in patients on labetalol, compared with those on methyldopa, results of a retrospective study found.
Ultrasounds, nonstress tests, amniocentesis, genetic counseling and deliveries are performed at Hutzel Hospital.
She was managed as an inpatient with daily nonstress tests and the pregnancy was successfully prolonged until 32 weeks when she underwent an elective cesarean section and curettage to remove the densely adherent placenta and no hysterectomy was required [10].
DURING PRENATAL CARE, a woman underwent weekly nonstress tests due to excessive amniotic fluid until the level returned to normal.