What is a screening mammogram?
A mammogram is an X-ray test of the breast (mammary glands) used to screen for breast problems, such as a lump.
Why is it done?
A mammogram is done to help screen for or detect breast cancer. Many small tumors can be seen on a mammogram before they can be felt by a woman or her health professional.
Mammograms do not prevent breast cancer or reduce a woman's risk of developing cancer. However, regular mammograms can reduce a woman's risk of dying from breast cancer by detecting it in its early stages.
Learn more about breast cancer screening guidelines for mammograms.
How do I prepare?
On the day of your mammogram, do not use any deodorant, perfume, powders or ointments on your breasts. The residue left on your skin by these substances may interfere with the X-rays.
If you are still having menstrual periods, you may want to have your mammogram done within two weeks after your menstrual period ends. The procedure will be more comfortable, especially if your breasts become tender during this time.
How is it done?
A mammogram is done by a radiology/mammogram technologist. You will need to:
- remove any jewelry that might interfere with the X-ray picture
- remove your clothes above the waist; you will be given a cloth or paper gown for the test.
If you are concerned about an area of your breast, show the technologist so that the area can be noted. You usually stand during a mammogram; sometimes you may also be asked to sit or lie down, depending upon the type of X-ray equipment used.
One at a time, your breasts will be positioned on a flat plate that will acquire the image. Another plate compresses your breast tissue. Very firm compression is needed to obtain high-quality pictures.
You may be asked to lift your arm or use your hand to hold your other breast out of the way.
For a few seconds while the X-ray picture is being taken, you will need to hold your breath. Usually at least two pictures are taken of each breast, one from the top and one from the side.
How long does it take?
You may be in the mammogram clinic for up to an hour; the mammogram itself takes about 10 to 15 minutes. You will be asked to wait; usually about 5 minutes; until the X-rays are developed, in the event repeat pictures need to be taken.
In some clinics and hospitals, X-ray pictures can be viewed immediately on a computer screen (digitally).
How does it feel?
The X-ray plate will feel cold when you place your breast on it. Having your breasts flattened and squeezed is usually uncomfortable. However, it is necessary to flatten out the breast tissue to obtain the best images.
What happens after the test?
A radiologist will interpret your exam. The technologist who administers the test cannot interpret or discuss what they are viewing while performing the exam. A report will be sent to your physician's office to discuss results.
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Beginning on January 1, 2012, state law requires that all patients who undergo a mammogram will be provided with the following information:
If your mammogram demonstrates that you have dense breast tissue, which could hide abnormalities, and you have other risk factors for breast cancer that have been identified, you might benefit from supplemental screening tests that may be suggested by your ordering physician.