Notes on Non-Stress Test
Rahul's Noteblog
Notes on Ob/Gyn
Notes on Non-Stress Test
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
Random Pages:
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