APACHE Scoring table

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The Scoring table for APACHE II describes how various fields we collect affect the ultimate APACHE II score.

The calculation of the store happens automatically and data collectors do not need to fit patient scores into this ranking or perform calculations.

Physiological Variables

MAX score = 48

 AP phys nameAP phys unitAP phys absMaxAP phys warnMaxAP H4AP H3AP H2AP H1AP 0AP L1AP L2AP L3AP L4AP phys warnMinAP phys absMin
AaDO2Alveolar-arterial oxygen tension difference>500>=350 and <500>=200 and <350<200
AP Dias BP FieldDiastolic blood pressuremmHG200128as per Mean BP2515
HRHeart Ratebeats/min205250>=180>=140 and <180>=110 and <140>=70 and <110>=55 and <70>=40 and <55<40105
KPotassiummmol/L129.9=>7>=6 and <7>=5.5 and <6>=3.5 and <5.5>=3 and <3.5>=2.5 and <3<2.511
Serum CO2Serum CO2mmol/L440285≥52>=41 and <52>=32 and <41>= 22 and <32>=18 and <22>=15 and <18<1522
NaSodiummmol/L200190>=180>=160 and <180>=155 and <160>=150 and <155>=130 and <150>=120 and <130>=111 and <120≤11110070
AP Sys BP FieldSystolic Blood PressuremmHG360243as per Mean BP4925
TemperatureTemperature°C42.742.7>=41>=39 and <41>=38.5 and <39>=36 and <38.5>=34 and <36>=32 and <34>=30 and <32<3011
WBCWhite Blood Countx109/L517301>=40>=20 and <40>=15 and <20>=3 and <15>=1 and <3<10.020.01
FiO2fraction of inspired oxygenpercentage100100as per AaDO22020
HCThematocritpercentage33>=60>=50 and <60>=46 and <50>=30 and <46>=20 and <30<206878
Mean BPmean blood pressuremmHG>=160>=130 and <160>=110 and <130>=70 and <110>=50 and <70<49
PCO2partial pressure of carbon dioxide in arterial bloodmmol/L440285AaDO222
PO2partial pressure of oxygenmmHG650650>=70>=60 and <70>=55 and <60<5543
PHph7.997.97>=7.7>=7.6 and <7.7>=7.5 and <7.6>=7.33 and <7.5>=7.25 and <7.33>=7.15 and <7.25<7.1566
RRrespiratory ratebreaths/min9579>=50>=35 and <50>=25 and <35>=12 and <25>=10 and <12>=6 and <10<622
Creatinine (APACHE)serum creatinineµmol/L>=309>=178 and <309>=133 and <178>=53 and <133≤5252


A lot of these values follow very specific definitions and collection instructions. See individual linked articles for details. Especially, see

number of decimal points in definitions

Some values arrive with a higher decimal precision than the definitions. Since the definitions have holes, that would lead to values in the holes being undefined for points. This is solved by rounding the value to one decimal point and applying the score to that.

Glasgow Coma Scale (GCS)

For information on collecting and coding the values, see the Glasgow Coma Scale article.

  • GCS = EYE point + MOTOR point + VERBAL point
  • Neurological Points = 15 - GCS

Acute Physiologic Score (APS)

APS = #Physiological_Variables points + Neurological points from GCS

Inclusion of pH in absence of other ABG components


Swiss Army Knife.svg

  • Generally, if a pH value is present, other ABG values will be present as well. However, what if only a pH value is present? Should it's score be summed into the physiological score or not? The original paper appears to not be clear on this. We only have 2 records in our DB that have pH without other ABG values, and for one the pH score is 0, so Julie and Tina didn't notice this difference until now. Interpretations are:
    • reasoning to include in sum, Julie's interpretation: "under DEVELOPMENT OF APACHE “ …and serum pH was retained in preference to bicarbonate”"
    • reasoning to exclude it, Tina's interpretation: Paper said “Serum HCO2 … [Not preferred, use if no ABGs]”. So, any ABGs missing, I use SerCO2 instead.
  • We flipped a coin; we will go Julie's way :-) Ttenbergen 10:57, 2023 January 11 (CST)
  • Tina emailed Julie to confirm if she does a score-all, or ((score SerCO2) or (FIO2, PO2, CO2))+pH Ttenbergen 14:08, 2023 January 11 (CST)
  • added: no added date
  • action: no action date
  • Cargo

  • Categories

Age Points

The age of the patient is automatically generated from the date of birth and the date of admission when collecting data.

Age ≤44 45-54 55-64 65-74 ≥75
Points (agepts) 0 2 3 5 6

Chronic Health Score

The chronic health score is calculated from Chronic Health APACHE and Admit Type for APACHE II as follows:

Correct scoring for Apache II Chronic Health

If admit type is: "Medical (non operative)" or "Emergency Surgery" PLUS one or more Chronic Health APACHE is present:
Score = 5
If "elective surgery" PLUS one or more Chronic Health APACHEis present:
Score = 2
if Chronic Health APACHE is "none" then
Score = 0

Total Apache Score

TotApache = APS + Chronic Health points+ agepts

TotApache MAX =74

Related articles

Related articles: