Notes on Non-Stress Test

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What is a Non-Stress Test?

• Detects presence or absence of accelerations in fetal heart rate.

• Accelerations are abrupt increases in fetal heart rate above the baseline lasting < 2 minutes.

• Accelerations in fetal heart rate are unrelated to uterine contractions but occur in response to fetal movements.

• Accelerations are always reassuring.

Before 30 Weeks:

• The increase should be ≥ 10 beats/min lasting ≥ 10 seconds.

After 30 Weeks:

• The increase should be ≥ 15 beats/min lasting ≥ 15 seconds.

Reactive Non-Stress Test:

• Two accelerations within 20-minutes.

• Reassuring.

• Repeat in two weeks.

Non-reactive Non-stress Test:

• Less than two accelerations within 20 minutes.

• 80% are false positives.

• Due to fetal sleep, prematurity, medications, or CNS anomalies.

• Use vibroacoustic stimulation and retest.

• If still negative, perform biophysical profile or contraction stress test.

Additional Reading:

Notes on Stages of Labor:

1. Diagram of Stages of Labor
2. First Stage of Labor
3. Second Stage of Labor
4. Third Stage of Labor
5. Fourth Stage of Labor

Tests for Fetal Well-Being:

1. Notes on Non-Stress Test
2. Notes on Contraction Stress Test
3. Unresponsive Fetus Algorithm

Periodic Changes in Fetal Heart Rate:

1. Fetal Heart Rate Accelerations
2. Variable Decelerations of Fetal Heart Rate
3. Early Decelerations of Fetal Heart Rate
4. Late Decelerations of Fetal Heart Rate

Types of Spontaneous Abortion:

1. Notes on Complete Abortion
2. Notes on Incomplete Abortion
3. Notes on Threatened Abortion
4. Notes on Inevitable Abortion
5. Notes on Missed Abortion

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