What is the most common reason for blood films having red cells that are gray and white cells that are too dark?
a. Overrinsing
b. Buffering for too short a time
c. Stain or buffer is too acidic
d. Stain or buffer is too alkaline
ANS: D
When the stain or buffer it too alkaline, red cells will be gray and white cells will stain too darkly for good morphologic evaluation.
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