What is a core biopsy of the breast?
A core biopsy is the most accurate way to determine what caused an abnormal area seen on your mammogram or ultrasound.
During the procedure, a radiologist uses a needle to take tissue samples of an area of your breast.
The needle is guided by a computer-controlled needle guide on the mammography equipment or by an ultrasound machine.
Why do I need a core biopsy?
Sometimes a mammogram or ultrasound shows an area that cannot be fully explained by imaging alone. A biopsy helps determine whether the area is:
Normal tissue
A benign (non-cancerous) change
A high-risk breast lesion
Breast cancer
This information helps your healthcare team recommend the most appropriate next steps.
Your journey: What to Expect?
📅Abnormal Mammogram/Ultrasound ➜ 👩⚕️Core Biopsy Appointment ➜ 🧪Laboratory Testing ➜ 🔬Pathology Review ➜ 📞Results ➜ ✅Follow-up Care
How should I prepare?
Before your appointment
- Have breakfast
- Wear a supportive bra
- Arrive 15 minutes early
- Bring your health card
What happens during my core biopsy appointment?
(click on each section below to learn more)
Step 1 👩⚕️ | Step 2 🪑 | Step 3 🩹 | Step 4 🧪 | Step 5 ❄️ |
|---|---|---|---|---|
Brief introduction and consent
Your care team explains the procedure, answers your questions, and asks you to sign a consent form.
| Patient Positioning
You'll be positioned comfortably. Your breast may be gently compressed if mammography is used, or you'll lie on an exam table if ultrasound is used. | Area is Numbed
The radiologist numbs the area with local anesthetic. You may feel a brief sting. | Tissue Samples Are Taken
Several small tissue samples are collected using image guidance. You may feel pressure, but not significant pain. | Patient Recovery
Pressure and an ice pack are applied to reduce bleeding and bruising before you go home. |
When will I get the results?
Results are usually available within 7–10 business days.
The pathology report is sent directly to your healthcare provider, who will discuss the results and next steps with you.
Understanding your results
Your healthcare provider will talk about the results with you.
Your results may show the following:
(click on each to learn more)
✅ Benign (Non-cancerous)
No cancer is found. A follow-up mammogram or ultrasound may be recommended in about 6 months.
🔴 Malignant (Cancerous)
If cancer is found, your healthcare provider will refer you to a breast surgeon to discuss treatment options.
🟡 High-risk finding
Some non-cancerous findings may require further assessment by a breast surgeon.
🔄 Additional testing
Occasionally, another biopsy is recommended if more information is needed.
Instructions after returning home
- Leave the dressing (bandage) in place and keep it dry for 3 days after your procedure.
For pain, take acetaminophen if needed, or talk with your pharmacist.
📌 Note: If you have any other concerns, contact your healthcare provider. If you do not have one or they are unavailable, call NS Healthline at 811.