Specimen validity testing refers to the tests conducted by laboratories to determine if a urine specimen is diluted, adulterated or substituted. Prior to urine drug testing, specimen validity test is conducted to know whether the specimen is tampered or not. To report a specimen as tampered, laboratories conduct an initial validity test and a confirmatory validity test. Oxidants, Creatinine, Specific Gravity and PH are few substances detected in specimen validity test.

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