Test result could mean different things.
Gourlay
Douglas
D
D000697:Central Nervous System Stimulants / Q000652:urine*; D002648:Child; D006801:Humans; D008774:Methylphenidate / Q000652:urine*; D015813:Substance Abuse Detection / Q000379:methods*
D000697:Central Nervous System Stimulants; D008774:Methylphenidate