WASHINGTON — The Supreme Court on Monday let stand a decision temporarily blocking an Arizona law that limits the availability of medicinal, nonsurgical abortions. As is its custom when it denies review, the court gave no reasons for its action.

The law, enacted in 2012, requires abortion providers to comply with a 2000 protocol from the Food and Drug Administration for mifepristone, an abortion-inducing drug that is sometimes called RU-486. The Legislature said the law was meant to “protect women from the dangerous and potentially deadly off-label use of abortion-inducing drugs.”

The 2000 protocol calls for the drug to be given in higher doses than is customary today, and only in the first seven weeks of pregnancy.

In the years since the protocol was issued, doctors have found that a lower dose of the drug is effective and that it can be taken safely through the ninth week of pregnancy.