Table 1

 Minimum and maximum criteria that laboratories use when determining if a blood film is required for a previously unknown adult patient

Minimum range (median)Consensus guideline minimum4Maximum range (median)Consensus guideline maximum4
Hb, haemoglobin; MCV, mean corpuscular volume; WBC, white blood cell count.
Hb (g/dl; female)7 to 12 (10)<715 to 20 (17)2 g/dl above reference range
Hb (g/dl; male)7 to 13.5 (10)<715 to 20 (18)2 g/dl above reference range
WBC × 109/l2 to 4 (3)<410 to 30 (20)>30
Platelets × 109/l10 to 150 (120)<100400 to 800 (600)>1000
Neutrophils × 109/l0.5 to 2.5 (1.5)<17.5 to 30 (17.5)>20
Lymphocytes × 109/l0.1 to 1.5 (1)3.5 to 10 (4.5)>7
Monocytes × 109/l0.8 to 3 (1.5)>1.5
Eosinophils × 109/l0.4 to 5 (1.3)>2.0
Basophils × 109/l0.02 to 2.5 (0.35)>0.05
MCV (fl)60 to 80 (75)<7599 to 125 (101)>105