A bilateral screening mammogram is a routine breast cancer screening exam that uses low-dose X-ray imaging to look at both breasts (bilateral). The goal is to find early signs of breast cancer or other breast changes before you can feel a lump or notice symptoms. Most screening mammograms include two standard X-ray views of each breast (for example, top-to-bottom and side-to-side). Many facilities use digital mammography or 3D mammography (digital breast tomosynthesis), which can improve cancer detection in some people, especially those with dense breast tissue.

The test does not measure a “level” in the blood. Instead, it creates images that a radiologist reviews for breast abnormalities such as masses, unusual tissue distortion, or calcifications (tiny calcium spots that can sometimes be associated with cancer). Results are typically reported using a standardized system (often BI-RADS), which helps describe what was seen and what to do next.

In plain language, results generally mean one of the following:

Normal/negative: No concerning findings are seen. You will usually be advised to continue routine screening on the recommended schedule.

Benign (not cancer): A clearly noncancerous finding is seen (such as a cyst). Routine screening is usually continued.

Probably benign: The finding is very unlikely to be cancer, but short-term follow-up imaging may be recommended to confirm it stays stable.

Need additional imaging: The radiologist needs more views and/or a breast ultrasound to clarify an area. This is common and does not automatically mean cancer.

Suspicious/Highly suggestive of malignancy: Further evaluation, often including a biopsy, is recommended to determine whether cancer is present.

A bilateral screening mammogram is most commonly done as part of routine screening for people without breast symptoms. It is recommended because early detection can find breast cancer at a smaller size and earlier stage, when treatment options are often less extensive and outcomes may be better.

Your clinician may recommend screening based on:

Age and routine prevention: Many guidelines advise starting regular mammogram screening around age 40–50 and continuing every 1–2 years, depending on your personal risk and shared decision-making with your clinician.

Higher-than-average risk: Earlier or more frequent breast cancer screening may be recommended if you have a strong family history of breast/ovarian cancer, known genetic mutations (such as BRCA1/BRCA2), prior chest radiation at a young age, or a personal history of certain high-risk breast lesions.

Dense breast tissue: Dense breasts can make cancers harder to see on a standard mammogram. Your provider may discuss 3D mammography and/or additional screening (such as ultrasound or MRI) depending on your risk profile.

History of breast findings: If you have had prior biopsies, prior abnormal mammograms, or benign breast disease, ongoing screening helps monitor for new changes over time.

Important note: if you have new symptoms—such as a new lump, nipple discharge (especially bloody), skin dimpling, nipple inversion, or persistent focal breast pain—your provider may order a diagnostic mammogram (not a screening mammogram) and possibly ultrasound. Screening is designed for people without symptoms.

During the test, each breast is briefly compressed between two plates to spread the tissue for clearer X-ray images and lower radiation dose. Compression can be uncomfortable but usually lasts only a few seconds per image. The radiation exposure is low and considered safe for routine use in recommended screening schedules.

• Breast cancer (including invasive ductal carcinoma and invasive lobular carcinoma)
• Ductal carcinoma in situ (DCIS)
• Benign breast cysts
• Fibroadenoma (noncancerous breast lump)
• Benign calcifications and fibrocystic breast changes
• Breast asymmetry or architectural distortion
• Breast infection/inflammation (mastitis) and related changes

• Routine breast cancer screening and preventive care
• Early detection of breast cancer to improve treatment options and outcomes
• Monitoring overall breast health over time by comparing with prior mammograms
• Risk-based screening planning for women’s health (including those with family history or genetic risk)
• Clarifying whether breast changes are likely benign vs. need further evaluation (supporting timely follow-up)