Doctors and nurses in Washington warn that an anti-transgender sports initiative would subject girls to invasive sex-verification requirements to participate in school athletics.Initiative 638 would bar transgender girls from girls’ school sports teams and require students competing in girls’ sports to provide verification of their sex from a healthcare provider. Under the measure’s text, that verification would have to rely on reproductive anatomy, genetic makeup, or naturally produced testosterone levels.Medical professionals opposing the initiative say those requirements would create barriers for cisgender girls while excluding transgender girls.“I tell my kids and patients that my No. 1 job is to keep them safe,” Kelsey Gellner, a pediatric nurse and board member of the Washington State Nurses Association, told The Guardian. “I can say with confidence that girls do not want to have an unnecessary exam that creates an unsafe barrier.”Related: Washington ballot measure could force all girls to have genital inspections to play sportsDr. Libby Loft, a Spokane family physician, raised similar concerns.“The way the measure is written says that I, as a physician, cannot rely on a birth certificate,” Loft told The Guardian. “I have to examine someone’s reproductive anatomy — that seems inappropriate to me for a sports physical.”In an opinion essay published by The Seattle Times, Drs. Caitlin Blau, Glenna Martin, and Grace Shif and registered nurse Sam Doyle warned that the requirements could discourage girls from participating in sports.“The initiative is a government mandate forcing us to conduct medically unnecessary and potentially harmful tests on elementary, middle and high school girls,” they wrote.Related: Pediatrics association tells transphobes not to use its name to push for school sports genital examsThey warned that the requirements “would decrease participation, robbing girls of the physical, social and emotional benefits tha