How long can the urine specimen be stored before testing ?
Specimens can be stored in refrigerators at 2 to 8° C for up to two (2) days (48 hours) or frozen at 0° C, before testing. However, it is strongly recommend testing the sample as soon as possible after collection. Will commonly ingested substances such as vitamins, penicillin, aspirin, caffeine and acetaminophen (Tylenol), affect the results? No. The tests are drug and drug metabolite specific. Because these commonly ingested substances are chemically and structurally different after metabolized by the body from the drugs being tested for, they will under most circumstances not interfere with or compromise test results. My teenager tests positive for THC but claims exposure to “second hand smoke”. Is this possible? No. Urine concentrations of THC above the cutoff sensitivity level of the test, or a positive result, are not possible by exposure to second hand smoke. My teenager has a positive test for opiates but claims eating poppy seed bagels or other food products containing poppy se
