Table 1. Fetal heart rate pattern classification.

	Baseline	Variability	Deceleration	Acceleration
Reassuring	110–160 b.p.m.	>=5 b.p.m.	None	present
Non-reassuring	100–109 b.p.m. 161–180 b.p.m.	<=5 b.p.m. for exceeding 40 min and less than 90 min	Early deceleration Variable deceleration Single prolong deceleration up to 3 min	No acceleration with an already normal CTG is of dubious significance.
Abnormal	<100 b.p.m. >180 b.p.m. Sinusoidal pattern for more than 10 minutes	<5 b.p.m. exceeding 90 min	Late deceleration A commonly found variable deceleration Single prolong deceleration exceeding 3 min