Shu-Ling Fan

Nonadherence, Diversion, or Analytical Limitation? A Negative Urine Opiate Screen in a Patient Prescribed Hydrocodone

Urine drug testing is commonly used to assess adherence to prescribed opioid therapy. We describe a patient prescribed hydrocodone/acetaminophen who reported recent use but had negative urine opiate and oxycodone immunoassay screens, raising concerns regarding nonadherence or div...