Step 0 in the Diff-Quik Staining process is....

• A. perform thin even smear technique of aspirated specimen
• B. Fix smear with methanol
• C. Stain with Diff-Quik reagents
• D. Rinse with water

Answer: (A)

A thin, even smear of the aspirated specimen is the first essential step because it sets up the staining for clear, interpretable results. When cells are spread in a single, uniform layer, each cell is accessible to the dyes, and nuclear and cytoplasmic details stain distinctly. If the smear is thick or clumped, staining becomes patchy and cellular features can be obscured, making interpretation unreliable. Fixation with methanol follows after the smear is prepared to preserve morphology, and staining with the Diff-Quik reagents occurs after fixation, with rinsing steps in between. So the initial task is preparing that proper smear.