Table 2. . Frequency of CYP2C19 enzyme phenotype by major continental race.

CYP2C19 phenotype	European ancestry	African ancestry (sub-Saharan)	Asian ancestry
PM	2%	6%	13%
IM	26%	36%	46%
Normal	40%	30%	38%
RM	27%	19%	3%
UM	5%	3%	0%
Uncertain	<1%	6%	<1%

Frequencies summarized from populations in the Clinical Pharmacogenetics Implementation Consortium. [27].

IM: Intermediate metabolizer; PM: Poor metabolizer; RM: Rapid metabolizer; UM: Ultrarapid metabolizer.