Radiology• Updated 21 October 2026
Mammogram
A low-dose X-ray of the breasts used to find breast cancer early.
Results: Usually a few days
Quick Summary
Primary Purpose
To screen for breast cancer or investigate a breast lump.
What It Measures
Breast tissue, calcifications and masses.
Preparation
Don't use deodorant or powder on the day. Avoid the week before your period if breasts are tender.
Overview
Screening mammograms are recommended at certain ages; ask your doctor about when to start.
The breast is pressed between plates for a few seconds, which can be uncomfortable.
What It Measures
Masses
Lumps.
Calcifications
Tiny calcium spots.
How It's Performed
- 01
Positioning
Each breast is placed between two plates.
- 02
Pictures
Usually two views of each breast.
- 03
Afterwards
Return to normal.
Sources and further reading
Last updated 21 October 2026. For more detail, see these trusted health organisations.
- Mammography | Mammogram | Breast Cancer(opens in a new tab) · MedlinePlus, US National Library of Medicine
- Breast screening (mammogram)(opens in a new tab) · NHS