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SAPS II: Simplified Acute Physiology Score II

 

Input
 

Age		mo yr
Heart Rate		/min beats/min bpm
Systolic Blood Pressure		Pascal cmH2O cm[H2O] mm Hg mm/Hg mmHg mm[Hg] torr
Temperature		Cel Degrees C Degrees F degC degF
On ventilator or BiPAP within 24 hours	No (0) Yes (1)
PaO2/FIO2		kPa/FIO2 mmHg/FIO2
Urine Output		L/24H L/day mL/24H mL/day
BUN		mg/dL mmol/L
WBC		#/mcL #/microL / nl /mcL /microL /uL 10*3/uL 10*6/uL 10E+9/L 10^3/microL 10e3cells/mcL 10e6 cells/mcL 10e6cells/mcL K/mm3 K/uL Mill/mcl Million/ul Thous/mcL Thousand/uL X10E+09/L X10E+12/L cells/mcL cells/microL cells/uL m/cmm m/mmm3 thou/mcL x10(12)/L x10(3)/mcL x10(3)/microL x10(6)/L x10(6)/mcL x10(6)/microL x10(9)/L x1000/mm3 x10E3/uL x10E6/uL x10^12/L x10^3/mcL x10^3/microL x10^6/L x10^6/mcL x10^6/microL x10^9/L {cells}/uL
Potassium		mEq/L mmol/L
Sodium		mEq/L mmol/L
Bicarbonate		mEq/L mmol/L
Bilirubin		mcmol/L mg% mg/dL
Glasgow Coma Score		# count index logit none number points score [No Unit]
Chronic Diseases	No (0) Metastatic cancer (9) Hematologic malignancy (10) AIDS (17)
Admission Type	Scheduled surgery (0) Medical (6) Unscheduled surgery (8)

 

Results
 
Important: Inputs must be complete to perform calculation.

 

SAPS II Score		# count index logit none number points score [No Unit]
Logit		# count index logit none number points score [No Unit]
Hospital Mortality Probability		% fraction percent rate ratio

 

Data action

 

     
 
Include literature references: Yes   No

 

 

Notes

• For the SAPS 2 score to be correct, a value must be selected for every variable.

 
Equations used
 

SAPS II Score = AgeFactor + TemperatureFactor + Systolic Blood PressureFactor + Heart RateFactor + (On ventilator or BiPAP within 24 hours * PaO2/FIO2Factor ) + Urine OutputFactor + BicarbonateFactor + BilirubinFactor + SodiumFactor + PotassiumFactor + BUNFactor + Glasgow Coma ScoreFactor + WBCFactor + Chronic Diseases + Admission Type

Logit = (0.0737 * SAPS II Score)+ (0.9971 * ln(SAPS II Score + 1)) -7.7631

Hospital Mortality Probability = 100 * e(Logit) / (1 + e(Logit))

 

 

Calculation Details and Variables

• AgeFactor is assigned values by this ordered logic:
  • If Age <40 yr, AgeFactor = 0
  • Else if Age <60 yr, AgeFactor = 7
  • Else if Age <70 yr, AgeFactor = 12
  • Else if Age <75 yr, AgeFactor = 15
  • Else if Age <80 yr, AgeFactor = 16
  • Else AgeFactor = 18.
• HeartRateFactor is assigned values by this ordered logic:
  • If Heart Rate ≥160 beats/min, HeartRateFactor = 7
  • Else if Heart Rate ≥120 beats/min, HeartRateFactor = 4
  • Else if Heart Rate ≥70 beats/min, HeartRateFactor = 0
  • Else if Heart Rate ≥40 beats/min, HeartRateFactor = 2
  • Else HeartRateFactor = 11.
• SystolicBloodPressureFactor is assigned values by this ordered logic:
  • If Systolic Blood Pressure ≥200 mmHg, SystolicBloodPressureFactor = 2
  • Else if Systolic Blood Pressure ≥100 mmHg, SystolicBloodPressureFactor = 0
  • Else if Systolic Blood Pressure ≥70 mmHg, SystolicBloodPressureFactor = 5
  • Else SystolicBloodPressureFactor = 13.
• TemperatureFactor is assigned values by this ordered logic:
  • If Temperature ≥39 degC, TemperatureFactor = 3
  • Else TemperatureFactor = 0.
• Equation parameters such as On ventilator or BiPAP within 24 hours, have two or more discrete values that may be used in the calculation. The numbers in the parentheses, e.g. (0), represent the values that will be used.
• pafiFactor is assigned values by this ordered logic:
  • If PaO₂/FIO₂ ≥200 mmHg/FIO2, pafiFactor = 6
  • Else if PaO₂/FIO₂ ≥100 mmHg/FIO2, pafiFactor = 9
  • Else pafiFactor = 11.
• UOFactor is assigned values by this ordered logic:
  • If Urine Output ≥1000 mL/day, UOFactor = 0
  • Else if Urine Output ≥500 mL/day, UOFactor = 4
  • Else UOFactor = 11.
• BUNFactor is assigned values by this ordered logic:
  • If BUN ≥84 mg/dL, BUNFactor = 10
  • Else if BUN ≥28 mg/dL, BUNFactor = 6
  • Else BUNFactor = 0.
• WBCFactor is assigned values by this ordered logic:
  • If WBC ≥20 x10(3)/mcL, WBCFactor = 3
  • Else if WBC ≥1 x10(3)/mcL, WBCFactor = 0
  • Else WBCFactor = 12.
• PotassiumFactor is assigned values by this ordered logic:
  • If Potassium ≥5 mmol/L, PotassiumFactor = 3
  • Else if Potassium ≥3 mmol/L, PotassiumFactor = 0
  • Else PotassiumFactor = 3.
• SodiumFactor is assigned values by this ordered logic:
  • If Sodium ≥145 mmol/L, SodiumFactor = 1
  • Else if Sodium ≥125 mmol/L, SodiumFactor = 0
  • Else SodiumFactor = 5.
• BicarbonateFactor is assigned values by this ordered logic:
  • If Bicarbonate ≥20 mEq/L, BicarbonateFactor = 0
  • Else if Bicarbonate ≥15 mEq/L, BicarbonateFactor = 3
  • Else BicarbonateFactor = 6.
• BilirubinFactor is assigned values by this ordered logic:
  • If Bilirubin ≥6 mg/dL, BilirubinFactor = 9
  • Else if Bilirubin ≥4 mg/dL, BilirubinFactor = 4
  • Else BilirubinFactor = 0.
• GCSFactor is assigned values by this ordered logic:
  • If Glasgow Coma Score ≥14 points, GCSFactor = 0
  • Else if Glasgow Coma Score ≥11 points, GCSFactor = 5
  • Else if Glasgow Coma Score ≥9 points, GCSFactor = 7
  • Else if Glasgow Coma Score ≥6 points, GCSFactor = 13
  • Else GCSFactor = 26.

 

References

1. Le Gall JR, Lemeshow S, Saulnier F. A new Simplified Acute Physiology Score (SAPS II) based on a European/North American multicenter study. JAMA. 1993 Dec 22-29;270(24):2957-63. PubMed ID: 8254858

 

Associated Logical Observation Identifiers Names and Codes [LOINC]
 

Parameter	LOINC's and Suggested Units
Age	21612-7 : yr      21612-7 : yr      21612-7 : years      30525-0 : Years old      30525-0 : yr      30525-0 : years
Heart Rate	8867-4 : beats/min      8893-0 : beats/min      8890-6 : beats/min      8889-8 : beats/min      68999-2 : beats/min      76282-3 : beats/min      69000-8 : beats/min      69001-6 : beats/min
Systolic Blood Pressure	8480-6 : mmHg
Temperature	8329-5 : degC      8310-5 : degC      8331-1 : degC      8332-9 : degC      8333-7 : degC      8328-7 : degC      75539-7 : degC
BUN	3094-0 : mg/dL      6299-2 : mg/dL      14937-7 : mmol/L      59570-2 : mmol/L
WBC	6690-2 : #/microL
Potassium	2823-3 : mEq/L      6298-4 : mEq/L
Sodium	2951-2 : mmol/L      2947-0 : mEq/L      32340-2 : mEq/L      39791-9 : mEq/L
Bicarbonate	2028-9 : mmol/L      1959-6 : mEq/L      1960-4 : mEq/L      14627-4 : mEq/L      1961-2 : mEq/L      22735-5 : mEq/L      1963-8 : mEq/L
Bilirubin	1975-2 : mg/dL      32303-0 : mmol/L      59828-4 : mg/dL      54363-7 : mcmol/L      58941-6 : mg/dL
GCS	9269-2 : score      35088-4 : score

 
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