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The SHBG1 gene is one of the genes used in combination to determine your testosterone levels.
Note: the research cited for this gene is in reference to male testosterone levels. Due to differences in levels of sex hormones between men and women, the findings from these studies are not applicable to women.
Source: 1000 Genome Project. Global averages for both sexes
Sex-hormone binding globulin (SHBG) protein levels are regulated through this gene. This protein is involved in the transport of sex hormones which is how it can influence the levels of circulating testosterone.