The SMI One Step HBsAg Test Device (Serum/Plasma) is a
qualitative, lateral flow immunoassay for the detection of HBsAg in
serum or plasma. The membrane is pre-coated with anti-HBsAg
antibodies on the test line region of the test. During testing, the
serum or plasma specimen reacts with the particle coated with
anti-HBsAg antibody. The mixture migrates upward on the
membrane chromatographically by capillary action to react with
anti-HBsAg antibodies on the membrane and generate a colored
line. The presence of this colored line in the test region indicates a
positive result, while its absence indicates a negative result. To
serve as a procedural control, a colored line will always appear in
the control line region indicating that proper volume of specimen
has been added and membrane wicking has occurred.