Cytocentrifugation is used to deposit cells from a sparse fluid onto a slide while the fluid is absorbed by what?

• A. Filter paper
• B. Absorbent cotton
• C. Paper towel
• D. Felt pad

Answer: (A)

During cytocentrifugation, cells suspended in a sparse fluid are spun onto a slide while the surrounding liquid is drawn away by an absorbent material beneath the sample. The absorbent used is filter paper, because it wicks the liquid away efficiently through capillary action, concentrating the cells onto a defined area of the slide without disturbing them. Using other materials like absorbent cotton, paper towels, or a felt pad can introduce fibers, uneven absorption, or inadequate wicking, which is why filter paper is the appropriate choice for this process.