title: A simple rapid gaschromatographic method for the determination of theophylline in dried whole blood on filter paper cards.
mesh_terms: D001800:Blood Specimen Collection; D002849:Chromatography, Gas / Q000379:methods; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature; D013806:Theophylline / Q000097:blood*
chemical_list: D013806:Theophylline