Once a urine specimen is received in one of our labs, it is scanned into the system and receives a unique lab accession number of the most reliable identification and tracking. Then, an alliquoted sample undergoes validity testing (as a part of initial testing) using PH values, specific gravity and creatinine to ensure it is a human sample and that it has not been diluted or adulterat... https://devlabwerks.com/services/urine-drug-testing/