Overview

• More than 90% of female athletes slated for Tokyo have been tested, with remaining cases able to complete testing in Japan before competition.
• The test detects the SRY gene on the Y chromosome via cheek swab or blood test; those testing negative are eligible for the female category at world‑ranking events.
• Athletes who test positive for the Y chromosome may compete only in non‑world‑ranking female events or in other categories under World Athletics rules.
• Implementation has had wrinkles, including Canadian retests after noncompliant procedures and French athletes arranging testing outside France or at a pre‑Tokyo holding camp.
• Sebastian Coe cites overwhelming backing from athletes and federations, though some Canadian athletes described the process as invasive and burdensome.