Screening tool to assess the fetal state of oxygenation and predicts early signs of hypoxia and fetal distress.
• Stimulus: Contractions/ fetal movements
• Baseline fetal heart rate
• Baseline variability
• Accelerations
• Decelerations
baseline heart rate
Baseline variability
Classification:
Silent 0-5 bpm
Reduced 6-10 bpm
Normal 11-25 bpm
Saltatory >25 bpm
accelerations
Deceler
ations:
Decelerations Types:
Basal fetal oxygenation. The relationship of late decelerations to baseline fetal oxygenation during contractions
Contraction Stress Test
Signature +
Date & Time
DEFINE
RISK
CONTRACTIONS
BASELINE
RATE
VARIABILITY
ACCELERAT’N
DECELERAT’N
OVER ALL ASSESSMENT
• Baseline Rate 110-150 bpm
• Amplitude of baseline variability 5/10-25 bpm
• Absence of decelerations, except for fleeting& short
• Presence of 2 or more accelerations during a 20 min period
• Baseline rate of 150-170 bpm/ 100-110 bpm
• Amplitude of variability bn 5-10 bpm > 40 min
• Increased variability above 25 bpm {saltatory}
• Absence of accelerations for > 40 min
• Sporadic decelerations of any type, unless severe
• Baseline heart rate < 100 bpm or > 170 bpm
• Variability < 5 bpm for > 40 min
• Recurrent decelerations of any type
• Severe variable or late decelerations
• A sinusoidal pattern
Any of the following:
