WASHINGTON — The Supreme Court on Friday blocked enforcement of a Louisiana law that could force all but one of the state’s abortion clinics to close, a sign a similar law in Texas could be in peril.

The justices effectively reversed an order by the federal appeals court in New Orleans that allowed Louisiana to begin enforcing its 2014 clinic regulation law even as it is being challenged in the courts.

The law requires doctors who provide abortions to have admitting privileges at nearby hospitals.

Two clinics, in Boisier City and Baton Rouge, that had already closed in response to the appellate ruling will reopen and a third clinic in Shreveport that faced imminent closure will remain open, said the Center for Reproductive Rights, which is representing the clinics.

The high court’s order, with only Justice Clarence Thomas noting his dissent, came two days after the justices heard arguments in a major abortion case from Texas and just hours after they voted in a private meeting on the outcome of that case.

A vote for the clinics in Louisiana could signal that Justice Anthony Kennedy, whose vote is crucial to both sides, also will be a decisive fifth vote in favor of abortion clinics in Texas.

The cases are at different stages in the legal process, but they involve similar laws and actions by the same federal appeals court, the 5th U.S. Circuit Court of Appeals in New Orleans.

The appeals court was willing to let both states enforce the admitting privileges law. Additionally, the Texas law forces clinics to meet hospital-like standards for outpatient surgery.

The Supreme Court has previously put the Texas surgical center standards on hold and cited that action Friday. However. in 2013 the court split 5-4 in allowing Texas to require doctors to have hospital admitting privileges to perform abortions in clinics.