CYP2D6*148 is assigned unknown function. CYP2D6*148 is defined by four SNPs of which two are found on the normal function *2 allele. 77G>A (R26H) is found on the *43 allele and the normal function *46 allele, and the forth SNP (3854G>A, E480K) is present on the normal function *27 allele. Since the functional impact of 993C>G is unknown, consensus among experts was unknown function.