World Boxing provided a detailed explanation about the testing in its statement.

“The PCR test is a laboratory technique used to detect specific genetic material, in this case the SRY gene, that reveals the presence of the Y chromosome, which is an indicator of biological sex,” it said.

“The test can be a be conducted by nasal/mouth swab, saliva or blood.

“Athletes that are deemed to be male at birth, as evidenced by the presence of Y chromosome genetic material (the SRY gene) or with a difference of sexual development (DSD) where male androgenization occurs, will be eligible to compete in the male category.

“Athletes that are deemed to be female at birth, as evidenced by the presence of XX chromosomes or the absence of Y chromosome genetic material (the SRY gene) or with a DSD where male androgenization does not occur, will be eligible to compete in the female category.”

Under the new policy, national federations will be responsible for testing and will be required to confirm the sex of their athletes when entering them into World Boxing competitions by providing a certification of their chromosomal sex, as determined by a PCR test.

World Boxing said failure to provide that will render the athlete “ineligible to compete” and may lead to sanctions against the athlete or their national federation.

The organisation added: “Where test results for boxers that want to compete in the female category reveal Y chromosome genetic material and a potential DSD, the initial screenings will be referred to independent clinical specialists for genetic screening, hormonal profiles, anatomical examination or other valuation of endocrine profiles by medical specialists.

“As part of its new policy World Boxing will reserve the right to do genetic sex screening on new or existing athlete samples to confirm certification.

“The policy will include an appeals process. Support will be offered to any boxers that provide an adverse test result.”