Table 2. Filtration retains slightly more monocytes than other white blood cells.

% of total	granulocytes	lymphocytes	monocytes	other
whole blood	65±4	29±5	5±5	1±0
on filter	58±3	27±3	14±2	1±0
% change	−11±3	−5±6	165±37	1±30

Numbers give % of total ± standard deviation determined on 5 healthy donors. Each data-point was determined by counting at least 300 cells.