Table 2.

Performance of test strips with potential interferences

A negative result produces a red color at the test line; the intensities of these colors based on the intensity score card are indicated numerically and also coded as the intensity of red color in each cell. A strong red color (Neg-4 or greater) indicates a clear negative result, while a weak pink color (Neg-1, Neg-2, or Neg-3) indicates a faint test line that might be misread as a false positive