Table 2.

STAN^® clinical guidelines: ST-changes that prompt clinical intervention, such as delivery or solving a cause of fetal distress

	Intermediary CTG	Abnormal CTG
Episodic T/QRS-rise (duration < 10 min)	Increase > 0.15 from baseline	Increase > 0.10 from baseline
Baseline T/QRS-rise (duration ≥ 10 min)	Increase > 0.10 from baseline	Increase > 0.05 from baseline
Biphasic ST (a component of the ST-segment below the baseline)	Continuous >5 min or >2 episodes of coupled Biphasic ST type 2 or 3	Continuous >2 min or >1 episode of coupled Biphasic ST type 2 or 3

The ST log requires 20 minutes recording for automatic ST analysis to start. A decrease in signal quality with insufficient number of T/QRS measurements requires manual data analysis.