A petri dish with fertilized eggs: Freezing eggs for later use is a pricey insurance policy that many women will never need, argue some doctors.

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he American Society of Reproductive Medicine (ASRM) has concluded that freezing a woman's eggs should no longer be considered "experimental." The practice, which has long been targeted by critics who question its safety, has become increasingly popular in recent years as more and more women hope to get pregnant later in life. But is it really safe? Here's what you should know:

Why do women freeze their eggs?
Older women sometimes use the frozen eggs of younger women to become pregnant. And more and more, younger women in their twenties are freezing their eggs while they "finish school, focus on their jobs, or keep looking for the right guy," says Rob Stein at NPR. In other cases, the practice, which costs anywhere from $10,000 to $15,000, helps cancer patients preserve their fertility after chemotherapy wipes out their ovaries.

Why is this controversial?
Not everyone thinks it's a good idea for healthy women to "freeze their eggs as sort of an insurance policy against infertility in case they don't meet Mr. Right — or just aren't ready for motherhood — until their 30s or beyond, when the childbearing window is closing fast," says Lauran Neergaard at the Associated Press. Success rates aren't exactly through the roof, and often "it's an insurance policy that many of those women may never need to turn in," says Dr. Erica Widra at Georgetown University, who chaired the committee's guidelines. 

Why did ASRM change its tune?
Citing several studies, the group concluded that younger women have about the same odds of getting pregnant using frozen eggs for their infertility treatment as fresh ones. And babies born from frozen eggs "seem to be healthy," says NPR's Stein.

Does this procedure still have critics?
Indeed it does. "Don't believe the hype," argues Amanda Marcotte at Slate. Though technology has improved contraception rates, "the process of freezing eggs is somewhat dangerous, including a possible higher risk of developing ovarian cancer." And I, for one, am still suspicious of doctors "willing to take thousands of dollars from women to put them through this process on the slim hope that it's going to solve their work-life balance dilemmas." 

Sources: The Associated Press, CNN, NPR, Slate