POSITIVE:Â Only one colored band appears, in the control region (C). No colored band appears in the
test region (T) for the drug in question. A positive result indicates that the drug concentration exceeds the
detectable level.
NEGATIVE:Â Two colored bands appear on the membrane. One band appears in the control region (C)
and another band appears in the test region (T) for the drug in question. A negative result indicates that
the drug concentration is below the detectable level.
INVALID:Â Control band fails to appear. Results from any test which has not produced a control band (C)
NOTE:
1. The intensity of color in the test region (T) may vary depending on the concentration of analytes
present in the specimen. Therefore, any shade of color in the test region (T) should be considered
negative. Please note that this is a qualitative test only, and cannot determine the concentration of
analytes in the specimen.
2. Insufficient specimen volume, incorrect operating procedure or expired tests are the most likely
reasons for control band failure.
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