Which of the following substances may cause a false negative result for blood on the urine reagent strip? (Choose ALL of the correct answers)

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The page below is a sample from the LabCE course Chemical Screening of Urine by Reagent Strip (retired March 2012). Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Which of the following substances may cause a false negative result for blood on the urine reagent strip? (Choose ALL of the correct answers)

Please select the single best answer