A Screening Mammogram is a routine breast X-ray for women who do not currently have any breast symptoms. Its job is to find changes in the breast — sometimes years before a lump can be felt — when treatment is simpler and outcomes are best.
If your doctor has asked for a screening mammogram, it is a precaution, not a sign that something is wrong. Most screening mammograms come back normal.
Common Indications for a Screening Mammogram
A Screening Mammogram is typically recommended for:
- Women aged 40 and above as a yearly check, even without symptoms.
- Women under 40 with a strong family history of breast or ovarian cancer.
- Women who have been told they carry a BRCA1 or BRCA2 mutation, often combined with breast MRI.
- Women who have completed treatment for breast cancer and are on routine follow-up.
What exactly does a Screening Mammogram show?
It shows the internal structure of both breasts — fatty tissue, glandular tissue, calcifications, and any masses. The radiologist looks for early signs of breast cancer such as tiny clusters of calcium specks, distortion of the normal tissue pattern, or new lumps.
What happens during the procedure?
- You will undress from the waist up and put on a hospital gown.
- The mammographer will position one breast at a time on a flat plate of the machine.
- A second plate will gently press down to flatten the breast for a few seconds. This compression is what produces clear images.
- Two standard views are taken of each breast — one from the top, one from the side. So four images in total.
- The whole process usually takes about 15 to 20 minutes.
Do I need to prepare for a Screening Mammogram?
A little preparation makes the test smoother:
- No fasting is required. You can eat and drink normally.
- Wear a two-piece outfit (top and trousers or a skirt). You only undress from the waist up.
- Avoid deodorant, perfume, body spray, lotions, or powder on your breasts and underarms on the day of the test. These can show up as specks on the image and confuse the radiologist.
- If you are still menstruating, try to schedule the test for the week after your period ends, when breasts are usually less tender.
How long do the results take?
A screening mammogram is read by a radiologist after you have left the centre. Most Nigerian imaging centres will send your report to your referring doctor within 24 to 72 hours. If something needs urgent attention, the centre will usually call you to come back for additional imaging.
Will the test be painful?
Most women describe it as uncomfortable rather than painful, because of the compression. The discomfort lasts only a few seconds per image. If you are in real pain, tell the mammographer — they can reposition you and reduce the pressure slightly.
How often do I need a screening mammogram?
For most women aged 40 and above, once a year is the standard. Some doctors recommend every two years for low-risk women, and every six months for women on active surveillance after a previous abnormal finding. Follow your doctor's advice for your specific situation.
What if my screening mammogram is not normal?
Most callbacks are not cancer
Being asked to return for more images after a screening mammogram is common and usually not because cancer was found. Most callbacks turn out to be normal tissue, cysts, or benign changes. The follow-up is called a diagnostic mammogram and may include extra views or an ultrasound.
Can I have a screening mammogram if I am breastfeeding?
Yes. The radiation does not affect breast milk or the baby. However, lactating breasts are denser and harder to read, so your doctor may consider whether the test should wait until after you have weaned, depending on your risk.
Is a screening mammogram safe?
The radiation dose used is very low — roughly equivalent to a few weeks of natural background radiation. The benefit of detecting cancer early far outweighs this small risk for women in the recommended age groups.
Conclusion
A Screening Mammogram is one of the most powerful tools women have for protecting their long-term health. It is quick, low-dose, and most often returns reassuring news. Making it a yearly habit from age 40 — or earlier if you have risk factors — is one of the highest-leverage health decisions you can make.