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An alkaline urine can generate false-positives. A urine specimen may have a high pH because of medication, vegetarian diet, or if the urine is old. The test can also show a positive result if the test strip is left in the urine for too long. The cleaning products used to clean the urine container can also affect the test results. Some medications and substances used in medical treatments can also cause the test to show a false-positive result. Blood in the urine or high levels of bilirubin can also make the test show a false-positive result.