Detection of FPV Ag using FPV rapid diagnostic test kit.

Positive: Within the detection window, both the test line (T) and the control line (C) appear as purple-red bands.

Negative: Within the detection window, only the control line (C) has a purple-red band.

Invalid: In the detection window, the control line (C) does not appear as a purple-red band.

(Source: https://www.chenyanglobal.com/feline-panleukopenia-virus-antibody-test-kit.html)