OD492 - What does OD492 stand for? The Free Dictionary
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The optimum cutoff point of ELISA was determined by receiver operative curves (ROC) analysis using normalized OD492
value (PP%) as described elsewhere [12, 13].
The absorbance data (OD values) was normalized to eliminate interplate variations and make data comparable across the plates using the following formula: "percent positivity (PP%) = (OD492
sample serum--[OD.sub.492] negative control)/(OD492
positive control--[OD.sub.492] negative control) x 100%".
tyrosinase activity (%) = OD492
of sample/OD492 of control x 100.