Dilutions of 1: 600 and 1: 3000 of 1 μm diameter polystyrene latex suspensions are simple, inexpensive materials for quality control of Ortho ELT-8 platelet counts. The coefficient of variation (CV) for a 12-week period at the 350 × 109/1 level was 2·2%, comparable with that of a commercial control. The CV at the 70 × 109/1 level was 3·5%.
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