CYP2D6 poor metabolizer status can be ruled out by a single genotyping assay for the -1584G promoter polymorphism.
Gaedigk A, Ryder DL, Bradford LD, Leeder JS. CYP2D6 poor metabolizer status can be ruled out by a single genotyping assay for the -1584G promoter polymorphism. Clin Chem. 2003 Jun; 49(6 Pt 1):1008-11.