Only days after a federal panel scaled back on breast cancer screening recommendations for many women, another organization -- the American College of Obstetricians and Gynecologists -- has done the same for a screening credited with drastically reducing the rates of cervical cancer in the U.S.

Women of all ages should undergo Pap smears less frequently than they do now, those new guidelines say. And young women are advised not to bother until age 21.

The pullback follows the U.S. Preventive Services Task Force's dismissal of routine breast cancer screenings for women under 50. That move triggered a storm of protest from medical groups and individual women, with some breast cancer specialists and Republicans accusing health officials of moving toward a rationing of care and services.

On Wednesday, U.S. Health and Human Services Secretary Kathleen Sebelius stressed that the task force's guidelines amounted to advice, not policy, and that women should continue to consult with their physicians about mammograms based on their own history and needs.

But together, the two sets of revisions might give rise to a suspicion that women's health has suddenly taken a back seat to economic pressures, cancer specialists acknowledged Thursday. The annual Pap smear is the only reason some women see a physician, and some doctors fear that, without a sense of urgency to receive that test, many women might skip preventive health care.

"I understand


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some people may have a cynical view of this," said Robert Smith, the American Cancer Society's director of cancer screening. "But we want to assure women this is not motivated to save money."

Both sets of revisions emphasize the risks associated with annually screening millions of people who will never get breast or cervical cancer. But the creators of the cervical-screening recommendations say the two sets of guidelines are markedly different.

For starters, those recommendations reflect a broad consensus among medical groups. Most organizations agree that Pap testing does not lose its value if women are screened less frequently, said Edward Partridge, chairman of the cervical cancer screening guidelines panel for the National Comprehensive Cancer Network, an alliance of 21 cancer centers.

"Annual screening is too much," he said. "There is no real controversy there."

Further, the updated guidelines are based less on the potential for inaccurate results -- the concern regarding mammograms for women under 50 -- than on evolving knowledge about how cervical cancer develops. The disease progresses slowly, and many pre-cancerous changes resolve on their own.

Alan G. Waxman, who helped write the Pap test guidelines, published today in the journal Obstetrics & Gynecology , said doctors should counsel women that an annual check-up remains a good idea, even if a mammogram or Pap test is not scheduled.

What do the new guidelines say?

When should Paps start? » Routine Pap smears should start at age 21. Previously, the American College of Obstetricians and Gynecologists had urged a first Pap either within three years of first sexual intercourse or at age 21.

Women over 30 » Women 30 and older should wait three years between Paps once they've had three consecutive clear tests. Other national guidelines have long recommended the three-year interval; ACOG had previously backed a two- to three-year wait.

Other cases » Women with HIV, other immune-weakening conditions or previous cervical abnormalities may need more frequent screening.