title: Letter: Guanidine interference in determination creatine kinase.
mesh_terms: D000367:Age Factors; D001322:Autoanalysis; D003402:Creatine Kinase / Q000097:blood*; D005260:Female; D006146:Guanidines / Q000494:pharmacology*; D006801:Humans; D008297:Male; D008722:Methods; D012737:Sex Factors; D013050:Spectrometry, Fluorescence
chemical_list: D006146:Guanidines; D003402:Creatine Kinase