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The page below is a sample from the LabCE course Chemical Screening of Urine by Reagent Strip. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Blood Reaction

The test for blood on the reagent strip is based on the peroxidase-like activity of hemoglobin, which catalyzes the reaction of cumene hydroperoxide and 3, 3', 5, 5' tetramethylbenzidine.
The test is sensitive to free hemoglobin, myoglobin, and a minimum of 5 intact RBCs per microliter of urine.