RCOG cardiotocographic (CTG) classification Normal A CTG where all four features fall into the reassuring category. Suspicious A CTG whose features fall into one of the non-reassuring categories and the remainder of the features are reassuring.

RCOG cardiotocographic (CTG) classification Pathological A CTG whose features fall into two or more non-reassuring categories or one or more abnormal categories.

Features of CTG Fetal Heart rate feature classification Baseline (bpm) Variability (bpm) DecelerationsAccelerations Reassuring ≥5NonePresent Absence of accelerations with otherwise normal CTG is of uncertain significance Non-reassuring100 – <5 for ≥40 but <90 min early Variable Single prolonged for up to 3 minutes Abnormal<100 >180 Sinusoidal pattern for ≥10 minutes 90 minututes atypical Late Single prolonged for >3 minutes