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Table 2 Tiered Maternal Physiologic Alerts

From: Use of a novel electronic maternal surveillance system to generate automated alerts on the labor and delivery unit

Parameter Low Red Low Black Normal High Black High Red Notes
Systolic Blood Pressurea < 85 b 85–89 90–139 140–159 ≥ 160  
Diastolic Blood Pressurea   <  50 50–99 100–109 ≥ 110  
Temperaturec   <  36 <  38 ≥ 38 ≥ 38.5  
Heart Rated   <  50   ≥ 120 ≥ 130  
Pulse oximetry <  93% <  95% ≥ 95%    
Oliguria < 30 ml/hr      Alert is only triggered if a magnesium infusion is being administered.
Shock Index (heart rate divided by systolic blood pressure)     ≥ 1.2 ≥ 1.3 Alert will only trigger if systolic blood pressure is also < 105 mmHg, and patient is within 4 h of delivery.
Hematocrit <  18% <  21%     
Glucosee <  50, <  60 <  70 70–149 150–279 ≥ 280 Glucose < 70 mg/dL alerts only if patient is on insulin or in in the operating room.
Glucose < 50 mg/dL creates a red alert for every patient.
Unmeasured Blood Glucose with Insulin Infusion     Blood glucose measured 2 hours ago. Blood glucose measured 3 h ago.  
Platelet Countf   <  80     
  1. aUnits are millimeters of mercury
  2. bValues in bold typeface are parameters that will trigger a “flashing red” alert, which will also generate a page to clinicians
  3. cUnits are degrees Centigrade
  4. dUnits are beats per minute
  5. eUnits are milligrams per deciliter
  6. fUnits are thousands per microliter
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