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Nonstress test and contraction stress test

Author
David A Miller, MD
Section Editor
Charles J Lockwood, MD, MHCM
Deputy Editor
Vanessa A Barss, MD, FACOG

INTRODUCTION

Fetal health is evaluated, in part, by assessment of fetal heart rate (FHR) patterns. The primary goal is to identify fetuses at risk of intrauterine death or neonatal complications and intervene (often by delivery) to prevent these adverse outcomes, if possible.

The nonstress test (NST) and the contraction stress test (CST) are used for antepartum FHR testing. An abnormal test (nonreactive NST, positive CST) is sometimes associated with adverse fetal or neonatal outcomes, while a normal test (reactive NST, negative CST) is usually associated with a neurologically intact and adequately oxygenated fetus. When interpreting these tests, the clinician needs to account for gestational age, prior results of fetal assessment, maternal conditions (including medications), and fetal condition (eg, growth restriction, anemia, arrhythmia).

The NST and CST will be reviewed here. Intrapartum fetal evaluation and additional techniques for assessing fetal health are discussed separately.

(See "Intrapartum fetal heart rate assessment".)

(See "The fetal biophysical profile".)

                     

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Literature review current through: Nov 2016. | This topic last updated: Wed Feb 17 00:00:00 GMT 2016.
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