An estimate of the white blood cell count can be made from the peripheral blood smear. This can be used to confirm an electronic count, or to get a rough estimate if no electronic count is available.
average WBCs per high power field (using 40x objective)
estimated WBC per microliter
< 2
< 4,000
2 - 3
4,000 - 7,000
4 - 6
7,000 - 10,000
7 - 10
10,000 - 13,000
11 - 20
13,000 - 18,000
> 20
> 18,000
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