Used in research and diagnostic assays to detect phosphorylcholine (PC) epitopes present on pathogens such as Streptococcus pneumoniae and certain parasites. It serves as a reference antibody in immunoassays to study the immune response to PC-containing antigens and supports the development of vaccines and therapeutic antibodies targeting PC-expressing microorganisms. Also applied in flow cytometry, ELISA, and Western blotting to quantify and characterize PC-modified proteins and cells.