title: Blood spot on chromatography paper (DE 81) for detection of hepatitis B virus surface antigen (HBsAg).
mesh_terms: D001800:Blood Specimen Collection / Q000379:methods*; D002854:Chromatography, Paper / Q000295:instrumentation; D006514:Hepatitis B Surface Antigens / Q000032:analysis*; D006801:Humans; D011863:Radioimmunoassay
chemical_list: D006514:Hepatitis B Surface Antigens