WASHINGTON • Gay and bisexual men in monogamous relationships can give blood in the U.S. without abstaining from sex under updated federal health guidelines that focus on donors’ behavior, not their sexual orientation.

The Food and Drug Administration guidelines finalized Thursday ease decades-old restrictions designed to protect the blood supply from HIV.

The agency announced plans for the change in January and said this week the new approach now can be implemented by blood banks.

The updated guidelines do away with a requirement that men who have sex with men abstain from sex for three months before giving blood.

Instead, all potential donors — regardless of sexual orientation, sex or gender — will be screened with a new questionnaire that evaluates their individual risks for HIV based on sexual behavior, recent partners and other factors. Potential donors who report having anal sex with new partners in the last three months will be barred from giving until a later date.

The FDA said the new policy reflects the latest scientific evidence and is in line with rules in the U.K. and Canada.

It’s the latest move by the FDA to broaden donor eligibility, with the potential to boost donations.

“The implementation of these recommendations will represent a significant milestone for the agency and the LGBTQI+ community,” Dr. Peter Marks, director of the FDA’s center for biological therapies, said in a statement.

Anyone who has tested positive for HIV will continue to be ineligible to donate blood.