If I cannot provide sufficient urine during a drug test, is it a refusal?

If you fail to provide a sufficient specimen when directed by the collector, and it has been determined, through a required medical evaluation, that there was no adequate medical explanation for the failure, it may be considered a refusal to test. According to 49 CFR part 40, the collector must begin the “shy bladder” or “dry mouth” procedures if you cannot provide a sufficient sample. You will have three hours to provide a sufficient amount of urine (45mL sample from a single void), or one hour to provide a sufficient amount of oral fluids (2mL single sample). If you cannot, the collector notifies your employer who will direct you to obtain a medical evaluation. If it is determined that a medical condition precluded you from providing a sufficient specimen, the test may be canceled and would not be considered a refusal. However, if there is not a medical condition that caused the insufficient sample, the collection will be considered a refusal.