CAMLPR Hematology Practice Test 2026 - Free Hematology Practice Questions and Study Guide

The WBC histogram gates cells by size to separate white cells from much smaller platelets. A cutoff around 35 femtoliters is used, so events larger than 35 fL are counted as white cells while the tiny platelets (and other debris) are excluded. This threshold effectively distinguishes the larger white cells from the smaller platelet population, giving an accurate WBC distribution.