Biological male is women’s Ivy League swimming champion

Thomas set a new pool record with a time of 4:37.21.

Thomas' eligibility to compete was called into question after the USA Swimming announced a new policy earlier this month relating to transgender athletes and the amount of time biological males must suppress their testosterone levels prior to competing against women. The new rule is that it should be about three years. This still does not bring testosterone levels of biological males into the average range of testosterone for females.

The USA Swimming Athlete Inclusion, Competitive Equity and Eligibility Policy states that potential competitors must show "evidence that the concentration of testosterone in the athlete's serum has been less than 5 nmol/L (as measured by liquid chromatography coupled with mass spectrometry) continuously for a period of at least thirty-six (36) months before the date of application."

However, Thomas was eligible to compete because the new requirements don't take effect until the 2022 winter swimming season.

"The recent rule changes do not impact Lia's eligibility for this month's Ivy League Women's Swimming & Diving Championships as the effective date for this unprecedented midseason NCAA policy change begins with the 2022 NCAA Winter Championships," an Ivy League spokesperson said in an email to Swimming World last month.

Thomas, who has shattered a number of records and won races by staggering lengths, has brought national attention to the issue of biological males competing in women's sports.