Interpretation of SD Rapid TB results. (A) Sample insertion. (B) Test result. (C) Internal control; 1. Negative result; 2. Positive result. When serum or plasma applied (A), it flows past the antigen line (B). Bound antibody is detected by a goat anti-human IgG antibody conjugated to colloidal gold particles which produces one pink line when bound to human antibody. The test is considered positive when at least the antigen line and the control line (C) develop a pink color.
Said Toihir et al. BMC Research Notes 2011 4:403 doi:10.1186/1756-0500-4-403