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Screening & findings
The mammogram appointment, and being called back
Twenty minutes from walking in to walking out, a few seconds of pressure that everyone dreads, and sometimes a letter afterward asking you to come back. Here is what each part is actually like.
What a mammogram appointment is like
A screening takes about twenty minutes from walking in to walking out, and the imaging itself only a few minutes of that. You undress from the waist up and put on a gown. A technologist positions one breast at a time on a plate, and a second plate presses down firmly for a few seconds while the picture is taken. Then it is repeated from a second angle.
The pressure is the part people dread. It is uncomfortable and occasionally sharp, and it is over in seconds. Compression is what spreads the tissue thin enough to see through, and it lets the machine use less radiation. If you still have periods, booking in the week after one usually means less tenderness.
Most machines now take pictures in thin slices as they sweep across, which is called tomosynthesis or 3D mammography. It reads more like flicking through pages than looking at one flat image, and it makes overlapping tissue less likely to hide something or to look like something.
- Skip deodorant, powder, and lotion on the day. They can leave specks on the image that look like .
- Bring the name of the place your last mammogram was done. Comparing this year to last year is one of the most useful things a radiologist can do.
- A two piece outfit is easier than a dress.
- Tell them if you are breastfeeding, might be pregnant, or have implants, because the technique changes.
Being called back after a mammogram
Getting called back after a screening mammogram is frightening and it is common. It usually means the radiologist saw an area that the standard pictures do not show clearly enough, not that they saw a cancer. The overwhelming majority of callbacks end with nothing wrong.
What happens next is usually a diagnostic mammogram with extra views, sometimes an , and often a radiologist reading it while you wait so that you leave with an answer rather than another wait. If something does need sampling, the usual next step is a , which is done through numbed skin and takes well under an hour.
Your report will carry a number. It is shorthand for what should happen next rather than a score of how worried to be. Ask which number you were given and what it means, because the letter you receive in the post often does not say.
Being told you need one is not the same as being told you have cancer. Most breast biopsies come back benign. What a biopsy is like, how long results take, and what the answers mean is on its own page.
Where this comes from
- American Cancer Society recommendations for the early detection of breast cancer
- US Preventive Services Task Force, Breast Cancer: Screening, Grade B for women aged 40 to 74
- Breast Cancer Screening for Women at Higher-Than-Average Risk: Updated Recommendations From the ACR, Journal of the American College of Radiology, 2023
- ACR and Society of Breast Imaging statement, 17 April 2026
- Screening for Breast Cancer in Asymptomatic, Average-Risk Adult Females: A Guidance Statement From the American College of Physicians (Version 2), Annals of Internal Medicine, 17 April 2026
- NCCN Guidelines for Breast Cancer Screening and Diagnosis
- US Food and Drug Administration, Mammography Quality Standards Act final rule, breast density notification required from 10 September 2024
Guidelines change. This page states what each organization said on the date above. If you are reading it long after that, check the links.