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rs7900194, also known as 449G>A, 3627G>A or R150H, is a SNP in the CYP2C9 gene. The rs7900194(A) allele defines the CYP2C9*8 variant, which has decreased activity. According to a 23andMe discussion This is one of the SNPs which were re-analyzed April 2009. Customers with older data may wish to redownload. SNPs effected rs4420638, rs34276300, rs3091244, rs34601266, rs2033003, rs7900194, rs9332239, rs28371685, rs1229984, and rs28399504. [PharmGKB:Curated Phenotype: In African Americans patients, weekly warfarin dose requirements were lower in those with the CYP2C9*8 allele (34 (30-47) mg; P = 0.023) and the CYP2C9 *2, *3, *5, *6, or *11 allele (33(28-40 mg); P < 0.001) as compared with those with the CYP2C9*1/*1 genotype (43 (35-56) mg). Adding the *5,*6,*8 and *11 alleles to a mod...