% of activity = O.D control - O.D of Sample / O.D of control X 100
In this positive control we got positive results but negative control we got negative result, what should we do? Which is considered the right assay?/
Disha: You have to be mindful that all your numbers are net readings (e.g., OD of control minus OD of reagent only, OD of sample minus OD of reagent only, etc). Then your equation should be fine.
At is of control you have to put the respective od value what you get for the reaction mixture without any test sample. I mean Zero concentration tube
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