Publications by authors named "Jayne Zona"
Background: We recently encountered several cases of possible false positive results of amphetamine on the Beckman Coulter AMPH assay, but not on the Siemens EMIT II Plus assay. Our clinical chart review suggested that ranitidine interference may be responsible for the false positive results of the AMPH assays.
Methods: Blank urine specimens spiked with ranitidine concentrations ranging from 5μg/ml to 5mg/ml were analyzed on both the AMPH and EMIT II Plus assays.