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From SNPedia

This SNP is supposed to serve as a marker for the Q318X null allele of the 21-hydroxylase gene. This would generally be associated, when homozygous, with the most severe form of congenital adrenal hyperplasia (salt wasting). However, a random survey of 10 publicly uploaded genomes showed all 10 to be carriers. This is well out of Hardy-Weinberg equilibrium, making the accuracy of this SNP as reported by 23andme suspect. Positive results should be clinically correlated and verified in cooperation with your health care provider.

CT is 93% of opensnp https://opensnp.org/snps/rs7755898#users so your observation holds. --- cariaso 01:38, 14 June 2015 (UTC)