WASHINGTON (AP) — Freezing human eggs can be successful in treating infertility — but guidelines issued Friday still urge caution for women hoping to pause a ticking biological clock.

Egg freezing had long been labeled experimental, but the American Society for Reproductive Medicine declared that’s no longer the case. The group cited studies that found younger women are about as likely to get pregnant if they used frozen-and-thawed eggs for their infertility treatment as if they used fresh ones.