Breast Cancer Screening & Diagnosis: A Complete Guide

Breast cancer screening and diagnosis covers the whole pathway — from finding abnormalities in people without symptoms (screening) to confirming the result with imaging and biopsy (diagnosis). The goal is to detect cancer as early as possible, when it is most treatable. This guide brings together every step, with links to read each topic in detail.

What are the screening methods?

Screening is done in people without symptoms to find abnormalities early. The main methods are breast self-exam, clinical exam by a doctor, mammography (especially 3D mammography), and ultrasound — often used together, particularly for dense breasts.

Reading the images and the BI-RADS score

Findings on mammography/ultrasound are graded for suspicion using the BI-RADS scale (0–6), which determines whether to follow up, do further tests, or proceed to biopsy.

Diagnosis by biopsy

When a suspicious finding is present, biopsy is the gold standard to confirm whether tissue is benign or malignant. Methods include FNA, core needle biopsy, and VABB; a pathologist then interprets the result and checks its concordance with the imaging.

Advanced testing

In some cases a blood test for circulating tumour DNA (liquid biopsy / ctDNA) may help monitor the disease.

Benefits and limitations of breast cancer screening

Screening aims to find breast cancer early, before symptoms appear, when treatment is most effective. Like any test, it has both benefits and limitations to weigh with your doctor.

Benefits

• Detects cancer at an early stage, often before a lump can be felt

• Allows less invasive treatment and a wider range of options

• Improves the chance of successful treatment and long-term survival

Limitations

• False positives — a suspicious result that turns out benign, which may cause anxiety or lead to further tests

• False negatives — some cancers, especially in dense breasts, may be missed

• Mammography uses a small dose of radiation

What about MRI?

Breast MRI is highly sensitive and is used mainly for people at high risk (for example a BRCA mutation or strong family history) or with very dense breast tissue. It can produce more false positives and is more costly, so it is used selectively alongside mammography and ultrasound.

Frequently asked questions about screening & diagnosis (FAQ)

What is the difference between screening and diagnosis?

Screening tests people without symptoms to find abnormalities early; diagnosis confirms, once an abnormality is found, whether the tissue is benign or malignant.

At what age should breast cancer screening begin?

Mammographic screening is generally recommended from around age 40. People at higher risk (e.g. a family history) may start earlier and screen more often. Consult a doctor for a personalised plan.

What is the difference between mammography and ultrasound?

Mammography shows calcifications and the overall picture well, while ultrasound is especially helpful for dense breasts and for telling cysts from solid masses. The two are often used together for accuracy.

Does every lump need a biopsy?

Not always — it depends on the BI-RADS score and the nature of the lump. A biopsy is recommended when the finding is suspicious, to confirm the diagnosis.

What is a BI-RADS score?

It is a scoring system for the level of suspicion on imaging, from 0 (needs further assessment) to 6 (confirmed cancer), used to decide the next step.

What screening is available at Namarak Hospital?

Namarak offers 3D mammography with AI, ultrasound, and modern biopsy technology, delivered by a dedicated breast-specialist team.

All articles in Screening & Diagnosis

• What is a 3D mammogram? (Hologic + AI)

• When should mammograms be discontinued (age 70+)

• Breast biopsy: a complete guide

• Core Needle Biopsy of the breast

• Interpreting core needle biopsy results

• Liquid Biopsy: ctDNA blood test

Medically reviewed by: Assoc. Prof. Dr. Youwanush Kongdan and the breast-specialist team at Namarak Hospital • Last updated: May 2026

Disclaimer: This information is for general education only and is not a substitute for personalised medical advice. Please consult a qualified specialist for diagnosis and treatment appropriate to your situation.

To book a screening or discuss your results, call +66 2 059 0245–48 or LINE @namark.