No. Medical certification is not required to change the gender options on your TSA PreCheck® application. If you are a member of the TSA PreCheck Application Program, you may call (855) 347-8371 weekdays, between 8 a.m. and 10 p.m. ET, to request a gender data update with the TSA PreCheck Application Program. Please note, updating your gender is not required to receive TSA PreCheck screening. You will receive TSA PreCheck screening even if your current gender differs from the gender you provided when you enrolled in TSA PreCheck, as long as the name on your reservation matches the name on record with TSA.