Most reference values are based on analysis of the first morning voided urine. The normal composition of urine varies considerably during a 24-hour period. Transfer the requested volume into the labeled urine transport vial. Measure and record this volume on the test request form and on the urine transport vial (see Pediatric Specimen Tubes below). Collect all urine for the next 24 hours so that the morning urine void on the second day is the final collection. On the day of the collection, discard the first morning urine void, and begin the collection after this void. ![]() The patient (or responsible individual) should be cautioned that the preservative may be toxic and caustic, and not to spill or discard the preservative. When the 24-hour urine output is less than 1 liter, 4 grams of boric acid can be used when boric acid is the specified preservative or 10 mL of 6N HCl can be used when HCl is specified. If a preservative is required, it is important that the designated preservative be in the urine collection container at the start of the collection. Record on the test request form any medications that the patient is receiving. To learn more about drug testing, visit our website.Many urine chemistry tests require a 24-hour collection. Ultimately, this versatility adds effectiveness to the program because the employer selects what solutions match their distinct situations, specific needs, and reasons for testing.Äownload our Guide to Establishing a Workplace Drug Testing Program. When various test types are used in combination with each other, employers can deploy a more comprehensive screening of job applicants and employees for both very recent drug use and longer term patterns of repetitive use. The specific goals of your workplace drug testing program and the duties of your employees determine if your organization screens for both very recent drug use and longer term patterns of repetitive use. Hair drug testing provides a much longer detection window, giving a more complete drug-use history that shows a pattern of repetitive use as far back as 90 days. Like oral fluid testing, hair testing offers the benefit of an observed collection which is not easily adulterated or substituted.Because collections are observed, it is drug test collection method that is very difficult for a donor to adulterate or substitute their specimen. Unlike urine testing, oral fluid testing is primarily used to detect illicit drugs. ![]()
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