False Negative Results

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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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False Negative Results

The presence of excess moisture/humidity can cause the ketone reagent to become nonreactive, resulting in a false negative test for ketones.

Urine specimens should not remain at room temperature if testing is delayed because ketones are unstable at room temperature.