Steiner procedure sections are cut at what thickness?

• A. 4 to 5 micrometers
• B. 10 micrometers
• C. 1 millimeter
• D. 2 to 3 millimeters

Answer: (A)

Thin sections are essential for the Steiner procedure because the staining reaction depends on even reagent penetration and precise visualization under light microscopy. Cutting sections at about 4 to 5 micrometers provides enough surface area for uniform deposition of the silver-based reaction while maintaining structural integrity of the tissue ribbon. If the sections are thicker, such as 10 micrometers, reagents penetrate unevenly and background clarity diminishes, leading to patchy or blurred staining. Extremely thick sections (millimeter range) are impractical for standard microscopy and would obscure detail. Therefore, 4 to 5 micrometers is the optimal thickness.