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A member asked:
Docs, could a lab tell the difference between concerta and focalin (dexmethylphenidate) xr in a urine sample?
A doctor has provided 1 answer
No: To detect d,l-methylphenidate (Concerta) or d-methylphenidate (Focalin) a quantitative LC-MS/MS test and critical-frozen specimen are required. Urine should be collected within 8 hours of dosing, and blood (serum/plasma) within 4 hours of dosing. These tests do not distinguish between d- and l- isomers of methylphenidate.
Answered 6/5/2014
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