Table 1.

The items of APACHE II system

Physiological Variable	High Abnormal Range					Low Abnormal Range
	+4	+3	+2	+1	0	+1	+2	+3	+4	Points
Temperature	≥41°	39 to 40.9°		38.5 to 38.9°	36 to 38.4°	34 to 35.9°	32 to 33.9°	30 to 31.9°	≤29.9°
Mean Arterial Pressure-mm Hg	≥160	130 to 159	110 to 129		70 to 109		50 to 69		≤49
Heart Rate	≥180	140 to 179	110 to 139		70 to 109		55 to 69	40 to 54	≤39
Respiratory Rate	≥50	35 to 49		25 to 34	12 to 24	10 to 11	6 to 9		≤5
Oxygenation: A-aDO2 or PaO2 (mm Hg)	≥500	350 to 499	200 to 349		<200
a. FD2 ≥0.5 record A-aD02
b. FD2 >0.5 record PaO2					PO2>70	PO2 61 to 70		PO2 55 to 60	PO2<55
Arterial pH	≥7.7	7.6 to 7.69		7.5 to 7.59	7.33 to 7.49		7.25 to 7.32	7.15 to 7.24	<7.15
Serum HCO3 (venous mEq/l)	≥52	41 to 51.9		32 to 40.9	22 to 31.9		18 to 21.9	15 to 17.9	<5
Serum Sodium (mEq/l)	≥180	160 to 179	155 to 159	150 to 154	130 to 149		120 to 129	111 to 119	≤110
Serum Potassium (mEq/l)	≥7	6 to 6.9		5.5 to 5.9	3.5 to 5.4	3 to 3.4	2.5 to 2.9		<2.5
Serum Creatinine (mEq/l)	≥3.5	2 to 3.4	1.5 to 1.9		0.6 to 1.4		<0.6
Haematocrit (%)	≥60		50 to 59.9	46 to 49.9	30 to 45.9		20 to 29.9		<20
White Blood Count (total/mm3)	≥40		20 to 39.9	15 to 19.9	3 to 14.9		1 to 2.9		<1
Glasgow Coma Score (GCS)
Score = 15 minus actual GCS

A. Total Acute Physiology Score (APS) (sum of 12 above points)

B. Age points (years) ≤44=0; 45 to 54=2; 55 to 64=3; 65 to 74=5; ≥75=6

C. Chronic Health Points (see below)

Total APACHE II Score (add together the points from A+B+C