Not all breast screening centers, or mammography labs, are created equal. So, women who want to be sure they are being safely served by qualified technicians should ask questions.

Among other things, they should find out if the radiologist who reads their breast mammogram is legally certified and how recently the X-ray equipment was calibrated to make sure the proper dose of radiation is being used.In October 1994, Congress required that all mammography facilities be certified by the Department of Health and Human Services. Radiologists who read the X-rays must be certified by the American College of Radiology (ACR). Previously, professional credentials were optional.

Other questions important to women include:

- After asking to see the radiologist's certification, ask how many mammograms he or she interprets per year. The ACR requires 480 films. Generally, accuracy goes up with volume as long as a doctor is not swamped or pressured for fast results.

- Is the X-ray equipment specifically designed for mammography? Look for a plate-like plastic breast-compression device and a removable grid that prevents radiation from scattering.

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- The ACR requires that mammogram machines be checked and calibrated once a year by a radiological physicist. Ask to see the report.

- How long does the facility keep mammograms on file? The ACR requires at least five years. Some states require more.

- The person performing the test is not the radiologist who will be reading it, but technicians also must be certified. Look for the credential in the same room where the mammography equipment is.

- Don't be afraid to ask these questions. Studies have shown there is much unevenness in the mammography business. If you are not happy with the answers, take your business elsewhere.

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