Which blood specimen is best for evaluating blood cell morphology?

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The main idea is that you want the cells to look exactly as they do in the body, without any artifactual changes from the blood collection method. Anticoagulants can alter cell appearance or introduce artifacts that mislead interpretation—things like altered membrane appearance, clumping, or other distortions. Using anticoagulant-free blood means there are no chemical additives to influence the cells, so a smear prepared promptly from fresh blood preserves true morphology of red cells, white cells, and platelets. This provides the most accurate view of cell size, shape, granularity, and nuclear features, which is essential for assessing morphology. In contrast, specimens treated with anticoagulants can introduce artifacts or distortions, making it harder to distinguish normal from abnormal morphology.