MedTest, Canton, Mich, has released a hydrocodone assay for use as an open-channel reagent or for use on the BS-200 and BS-480 chemistry analyzers for urine drug screening. Hydrocodone is a semisynthetic opioid derived from codeine and thebaine. It is used to relieve moderate to severe pain and to treat a cough. Commercial hydrocodone preparations are often combined with another medication to increase efficacy and reduce adverse effects. Hydrocodone is rapidly metabolized to hydromorphone and its glucuronide, and can be found in human urine for up to 3 days. For more information, visit AACC booth 2249 or MedTest.