Haematology Critical Ranges

Hospital patients critical ranges (includes out-patients)

Test	Reporting units	Lower limit	Upper limit
WBC	x 109/L	N/A	50
Hb	g/L	70
Platelets	x 109/L	50	1000
Neutrophils	x 109/L	0.5	30
INR			2.0 (if not on anticoagulants)
			5.0 (if on warfarin and fax results to pharmacy)
APTT	secs		50 (if not on anticoagulants)
			150 (if on heparin)
Fibrinogen	g/L	1.0

Community patients critical ranges

Test	Reporting units	Lower limit	Upper limit
WBC	x 109/L	2.0	50
Hb	g/L	80
Platelets	x 109/L	90	1000
Neutrophils	x 109/L	0.5	25
INR			5.0
Fibrinogen	g/L	1.0
D-Dimers	μg/L		Age Cut-off ≤ 50                     500 ug/L 51-60                   600 ug/L 61-70                   700 ug/L 71-80                   800 ug/L >80                      900 ug/L
Malaria		All malaria results to be phoned and faxed

*Also known as Panic Ranges

Reviewed August 2025