RICHMOND, Va. — A Virginia school board can block a transgender male from using the boys restroom when school starts next month, the US Supreme Court ruled Wednesday.

In a 5-3 decision, the high court put on hold a lower court ruling that ordered the Gloucester County School Board to let Gavin Grimm use the bathroom that matches his gender identity. The school board is expected to ask the justices to further intervene in the case later this month.

The decision means Grimm will be barred from using the boys bathroom for at least the first half of his senior year, said Josh Block, an attorney with the American Civil Liberties Union who’s representing Grimm.

The school board says it plans to formally ask the Supreme Court to review the decision by the Court of Appeals for the Fourth Circuit Court in Grimm’s case by the end of August, and then it will be months before the justices decide whether to do so.

Block said he’s disappointed the teen will have to begin another school year being ‘‘stigmatized and isolated from the rest of his peers just because he is transgender.’’ But he said he remains hopeful that Grimm will ultimately prevail in the case.

Grimm, who was assigned female at birth but identifies as male, was allowed to use the boys restroom at his high school for several weeks in 2014. But after some parents complained, the school board adopted a policy requiring students to use either the restroom that corresponds with their assigned gender or a private, single-stall restroom. Grimm argues the policy violates Title IX, a federal law that bars sex discrimination in schools.

The school board counters that allowing Grimm use the boys restroom raises privacy concerns and may cause some parents to pull their children out of school. An attorney for the board didn’t immediately respond to a request for comment.

If the justices agree to hear Grimm’s case, the order will remain on hold until the court makes a final ruling, the court’s ruling said. If they deny the school board’s petition for review, the order requiring the board to let Grimm use the boys bathroom will be reinstated.

The appeals court sided with Grimm in April, saying the federal judge who previously dismissed Grimm’s Title IX discrimination claim ignored a US Department of Education rule that transgender students in public schools must be allowed to use restrooms that ­correspond with their gender identity.