title: The paraxanthine:caffeine ratio in serum or in saliva as a measure of CYP1A2 activity: when should the sample be obtained?
authors.affiliation: Division of Clinical Pharmacology, Norrland University Hospital, Umeå, Sweden. olav.spigset@relis.rit.no
authors.forename: O
authors.initials: O
authors.lastname: Spigset
authors.forename: S
authors.initials: S
authors.lastname: Hägg
authors.forename: E
authors.initials: E
authors.lastname: Söderström
authors.forename: R
authors.initials: R
authors.lastname: Dahlqvist
mesh_terms: D000328:Adult; D019540:Area Under Curve; D002110:Caffeine / Q000097:blood / Q000493:pharmacokinetics*; D019388:Cytochrome P-450 CYP1A2 / Q000378:metabolism*; D006801:Humans; D008297:Male; D012463:Saliva / Q000378:metabolism*; D013048:Specimen Handling / Q000379:methods*; D013806:Theophylline / Q000097:blood / Q000493:pharmacokinetics*
chemical_list: D002110:Caffeine; D013806:Theophylline; D019388:Cytochrome P-450 CYP1A2; C021183:1,7-dimethylxanthine