one step strep A test 
 

One-Step Strep A Test utilizes two-site sandwich immunoassay technology for the detection of Group A Streptococcal antigen. The test consists of a membrane strip, which was pre-coated with rabbit anti-Strep A antibody on the test band region and goat anti-rabbit antibody on the control band region. A colored rabbit anti-Strep A antibody-colloid gold conjugate pad is placed at the end of the membrane. During testing, the Strep A antigen is extracted from the throat swab using Extraction Reagents A and B. The test strip is then immersed in the extracted sample. The mixture then moves chromatographically on the membrane to the immobilized rabbit anti-Strep A antibody at the test band reagent. If Strep A antigen is present in the specimen, a colored sandwich of solid phase - Strep A antigen - gold conjugate is formed on the test band region. Absence of the colored band at test band region indicates a negative result. Regardless of the presence of Strep A antigen, as the extract mixture continues to move laterally across the membrane to the immobilized goat anti-rabbit antibody test band region, a colored band at the control region will always appear.