Which method is used to stain for HBsAg?

The Orcein method is utilized for staining HBsAg (Hepatitis B surface Antigen) because it is specifically designed to visualize viral components. This technique uses Orcein, a dye that selectively binds to certain proteins, enabling the identification of the Hepatitis B virus in liver tissue and other samples. The affinity of Orcein for certain cellular structures and substances makes it particularly effective for highlighting the presence of HBsAg.

Other methods listed, such as Perl's Prussian blue, which stains for iron deposits, and the rapid Giemsa stain, typically used for blood smears and certain cellular components, are not specifically aimed at detecting viral antigens. The peroxidase reaction, while a valuable histochemical technique for various applications, is not specifically suited for the detection of HBsAg. Thus, the specificity and effectiveness of the Orcein method make it the appropriate choice for this particular staining application.