Should ‘High T’ determine eligibility for women’s sports?

By Kathryn Doyle (Reuters Health) – According to controversial new regulations, female athletes with as much testosterone in their blood as some men are not allowed to compete in women’s sporting events. In 2011 and 2012, the International Association of Athletics Federations (IAAF) and the International Olympic Committee (IOC) implemented new rules barring a female from competing in the women’s category if her blood testosterone level is above 10 nanomoles of testosterone per liter (nmol/L). Women usually have less than three nmol/L, according to Dr. Peter Sonksen of Kings College London. Men tend to have 10 to 30 nmol/L. But 2.5 percent of women have hyperandrogenism, meaning more testosterone in their blood than the reference range for females, usually due to genetics, Sonksen told Reuters Health by email.



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