Approximately 24 to 48 hours.

A dilute specimen is a urine specimen that has a greater concentration of water than that of a normal urine specimen. Dilute specimens are generally caused by oral hydration of fluids and are usually more clear in appearance that normal urine. It is possible that a specimen could be dilute due to inadvertent over-hydration, several medications taken by the donor or existing medical conditions. However, it is also possible that the donor has intentionally over-hydrated, or water-loaded, to avoid the detection of presence of drugs in the specimen.

The initial screening process at the lab separates the negative from non negative results. GCMS testing is an extremely accurate test that is completed on non negative results which provides quantitative results for the presence of a specific drug or drug metabolite.

"Is the boss singling me out? I just did a random last month? Joe, never gets tested? I don’t think this thing is random at all!"

Those are not uncommon concerns among some safety-sensitive employees, and many employers have been challenged in court to demonstrate that their programs are truly random. The reality is that in a truly random selection process, a high probability exists that some employees will be selected several times while others may never be selected. Why? Because after each selection, the employee’s name is returned to the same pool, and he or she becomes just as likely as anyone else to be selected next time.