It can't. If you are using Ben's kit, there is the FAS-DPD test for FC and CC--TC = FC + CC always and forever.

Ben's kit also has an OTO test for TC. This may come out lower. DISREGARD IT! The FAS-DPD is the most reliable test.

One of my objections to test strips is they ALWAYS seem to show TC lower than FC. So one of the pads MUST be wrong--Experience tells me the TC is, so I NEVER look at it.