A pathological CTG is one in which ≥2 non-reassuring or ≥1 abnormal features are present.
Abnormal features are:
- Baseline HR <100bpm, >180bpm, or a sinusoidal pattern for ≥10 mins
- Variability <5bpm for 90 mins
- Single prolonged deceleration >3 mins
- Atypical variable decelerations in >50% of contractions or late decelerations, both for <30 mins
Reference: NICE intrapartum care – National Institute for Health and Care Excellence (2014). Intrapartum care. CG190. London: NICE.
Previously published: 28/04/14, 09/04/15