Table 3.

Comparison of maternal early warning system

Early Warning System	Triggers for Evaluation
Modified Early Obstetric Warning System (MEOWS)	Either 1 red criterion or 2 yellow criteria must be yet to trigger evaluation Red RR <10 or >30 SpO2 <95 Temperature <35°C or >38°C SBP <90 mm Hg OR >160 mm Hg DBP >100 mm Hg HR <40 or >120 Neurologic response either unresponsive or responsive to pain only Yellow RR 21–30 Temperature 35–36°C SBP 90–100 mm Hg OR 150–160 mm Hg DBP 90–100 mm Hg HR 40–50 or 100–120 Pain score 2–3 Neurologic response to voice only
Maternal Early Warning Criteria	Any of the following criteria should trigger evaluation RR <10 or >30 SpO2 <95 on room air SBP <90 mm Hg or >160 mm Hg DBP >100 mm Hg HR <50 or >120 Oliguria <35 mL/kg for >2 h
Maternal Early Warning Trigger	Either 1 red criterion or 2 yellow criteria must be yet to trigger evaluation Red RR >30 SpO2 <90% Temperature >38°C SBP >60 mm Hg DBP >110 mm Hg Mean arterial pressure <55 mm Hg HR >130 Nursing clinically uncomfortable with patient status Yellow RR <12 or 25–30 Temperature <36 C SBP <80 mm Hg OR 156–160 mm Hg DBP <45 mm Hg or 106–110 mm Hg HR <50 or 111–130 SpO2 90%–93% Altered mental status

Abbreviations: DBP, diastolic blood pressure; HR, heart rate; RR, respiratory rate; SBP, systolic blood pressure.