A good control for reticulin stains is which organ?

• A. Liver
• B. Heart
• C. Spleen
• D. Brain

Answer: (A)

Reticulin stains reveal the delicate network of reticular fibers (type III collagen) that provides support in tissue. A good control tissue must have a readily visible and consistent reticulin framework so you can confirm the staining reagents and procedure are working properly. The liver is the ideal positive control because its architecture is built on a dense reticular scaffold—clear networks around hepatic sinusoids and in the portal tracts produce a distinctive, easily recognizable lattice when stained. Seeing this characteristic pattern confirms the stain is functioning correctly. In contrast, the heart has relatively sparse reticulin, the spleen’s reticular network can be more variable, and the brain has little reticulin in normal sections, making them unreliable as controls. Therefore, the liver is the best choice for a reticulin stain control.