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For the pain management panel only, regardless of the screen results, GC/MS confirmation for the following drugs are completed and reported individually as positive/negative with a detection limit of 100 ng/mL: morphine, codeine, oxycodone, oxymorphone, hydrocodone, hydromorphone.
Ephedrine is metabolized into norephedrine. Also called phenylpropanolamine or PPA, norephedrine has been banned as an over-the-counter substance. Ephedrine, similar in structure to amphetamines, can cause a false positive urine drug screen for amphetamines.In fact, Ephedrine is used sometimes by âclubbersâ in place of Ecstasy.phedra comes from the Ephedraceae family of plants. It has several scientific names, such as Ephedra major (America), Ephedra trifurca (America) and Ephedra sinica (this is Asian and called Chinese Ma Huang).