Table 1.

Standard phenotype nomenclature.

Phenotype	Allele Activity
Ultra-Rapid Metabolizer (UM)	Two supra-functional alleles
Rapid Metabolizer (RM)	One normal function and one supra-functional allele
Normal Metabolizer (NM)	Two normal function alleles (i.e., wild type)
Intermediate Metabolizer (IM)	One loss/null function allele and one normal/supra-function allele
Poor Metabolizer (PM)	Two loss/null function alleles