Clarifying promised rules on female eligibility, track and field’s governing body set a September 1 deadline Wednesday for athletes to pass a gene test for competing at the world championships.

World Athletics, track and field's governing body, has set a Sept. 1 deadline for female athletes to pass a gene test for competing at the world championships in Tokyo.

Track and field athletes aiming to take part in the female category in elite competitions will have to take a gene test from September, World Athletics has announced. The test will be in place in time for the World Championships which take place in Tokyo on September 13-21.