Effect of EDTA on Morphology of Neutrophils of Healthy Dogs and Dogs with Inflammation

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Abstract
Summary: Increased basophilia and foamy vacu‐olation in the cytoplasm of neutrophils in smears made within 1 hour of blood collection suggest inflammatory disease. Due to the mild increase in foamy vacuolation which occurred with time in EDTA, the significance of mildly vacuolated neutrophils in smears prepared a few hours after blood collection is questionable. However, moderate or severe foamy vacuolation should be considered clinically significant.In vitro morphologic changes in neutrophils from healthy dogs in EDTA include clear, discrete vacuoles in the cytoplasm, uneven distribution of cytoplasmic granules, irregular cell membrane and pyknosis. These neutrophils generally lack basophilia, have minimal foamy vacuolation of the cytoplasm and are morphologically different from neutrophils associated with severe inflammation.

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