Biopsy

A biopsy is a procedure in which a small sample of tissue is removed from the body so that it can be examined under a microscope to find out exactly what type of cells are present.

When a scan or a physical examination finds something unusual — such as a lump, a sore that will not heal, or an area of abnormal tissue — images alone cannot tell doctors whether those cells are harmless or dangerous. During a biopsy, a surgeon or specialist removes a tiny piece of that tissue. A pathologist (a doctor who studies tissue and cells) then looks at the sample through a microscope and writes a report. That report tells the treating doctor whether the cells are normal, inflamed, or cancerous, and guides every decision about treatment after that.

A biopsy is ordered whenever a doctor needs a definite answer about the nature of a suspicious area of tissue — not just a guess based on imaging. It is used across many parts of the body and for a wide range of medical concerns.

• A lump or mass found in the breast, skin, neck, or any soft tissue that cannot be explained by imaging alone.
• A skin lesion (an unusual patch, mole, or growth on the skin) that has changed in size, shape, or colour.
• Abnormal cells found during a cervical smear (Pap smear) test.
• A polyp (a small growth on the inner lining of the bowel or stomach) discovered during an endoscopy or colonoscopy.
• Swollen lymph nodes (small glands in the neck, armpit, or groin) that have not resolved after several weeks.
• A shadow or nodule seen on a chest X-ray or CT scan of the lung.
• Liver abnormalities seen on ultrasound or MRI that need further classification.
• Monitoring or confirming a diagnosis of an inflammatory condition such as Crohn's disease (a long-term inflammation of the digestive tract) or certain kidney diseases.
• Suspected bone marrow disorders, including some types of anaemia (low red blood cell count) or leukaemia (cancer of the blood cells).

A biopsy may not be suitable in certain situations. Your doctor will weigh these factors carefully before recommending the procedure.

• If the patient is taking blood thinners and cannot safely stop them before the procedure.
• If the tissue to be sampled is in a location that is very difficult or dangerous to reach, such as next to a major blood vessel.
• If the patient has a severe bleeding disorder (a condition where the blood does not clot properly).
• If the overall health of the patient makes even a minor procedure too risky — in these cases the doctor may use imaging results alone or consider an alternative approach.

A biopsy is generally a low-risk procedure, and for many types — especially needle biopsies of surface tissue — serious complications are uncommon. However, as with any procedure that involves breaking the skin, some risks do exist.

• Pain or discomfort at the biopsy site during or after the procedure, usually mild and short-lived.
• Bruising or minor bleeding at the sampling site, which typically settles on its own.
• Infection at the site where the tissue was taken, recognised by increasing redness, warmth, swelling, or discharge.
• Bleeding that is heavier than expected, more likely in patients who have bleeding disorders or who are on blood thinners.
• Small risk of damage to nearby structures (such as nerves, blood vessels, or organs) when the biopsy is taken from a deep or internal site.
• Rarely, a pneumothorax (collapsed lung) when a biopsy is taken from the chest or lung area — this is monitored for in hospital.
• An inconclusive result, meaning the sample taken was too small or did not include the right area, requiring the procedure to be repeated.
• Reactions to local anaesthetic (the numbing medicine used at the biopsy site), which are rare but possible.

How much preparation is needed depends on the type of biopsy. A simple skin biopsy done under local anaesthetic (a numbing injection at the skin surface) needs very little preparation. A deeper biopsy — for example, of the liver, lung, or lymph node — usually requires more steps. Your doctor or the hospital team will give you specific instructions for your situation.

Before the procedure, the medical team will typically ask about:

• Any blood-thinning medicines, including aspirin, anti-inflammatory tablets, or herbal supplements — these may need to be paused for several days beforehand.
• Any allergies, especially to local anaesthetics or skin disinfectants.
• Smoking and alcohol: for deeper biopsies, the team may ask the patient to avoid alcohol for at least a day before and to stop smoking for as long as possible, since both can affect healing.
• Fasting (not eating or drinking): for biopsies done under sedation (medicine that makes you deeply relaxed or sleepy) or general anaesthetic, you will usually be asked not to eat or drink for several hours beforehand. For simple local-anaesthetic biopsies, fasting is usually not required.

Tests that are commonly arranged before a biopsy include:

• Blood tests to check clotting ability (how well the blood can form clots to stop bleeding).
• A full blood count to check overall health.
• Imaging such as ultrasound, CT, or MRI to mark the exact location to be sampled.
• Sometimes an EKG (electrocardiogram, a recording of the heart's electrical activity) if sedation or general anaesthetic is planned.

During the procedure itself, the steps usually follow this general order — though the exact sequence varies by biopsy type and hospital:

• The patient changes into a hospital gown and lies or sits in a position that gives the doctor clear access to the area.
• The skin over the biopsy site is cleaned with an antiseptic (germ-killing) solution.
• A local anaesthetic is injected to numb the area. For deeper biopsies, sedation or general anaesthetic may be given through a drip in the arm.
• The doctor uses the appropriate tool — a fine needle, a core needle (a slightly wider hollow needle), a punch (a small circular blade for skin), or a surgical incision — to take the tissue sample.
• If imaging guidance is needed, the doctor watches a live ultrasound or CT image on a screen to guide the needle to exactly the right spot.
• The sample is placed in a labelled container with a preserving fluid and sent to the pathology laboratory.
• The biopsy site is closed with a small dressing, a stitch, or pressure depending on its size and location.
• The patient is moved to a recovery area to be observed, especially if sedation was used.

Most patients who have had a simple biopsy under local anaesthetic can go home the same day, usually within a few hours of the procedure. Those who received sedation or general anaesthetic are monitored in a recovery area until they are fully alert and their vital signs (pulse, blood pressure, and breathing rate) are stable. Recovery time varies depending on where in the body the biopsy was taken and what method was used.

• Wound care: keep the biopsy site clean and dry for as long as the medical team advises — usually at least 24 to 48 hours. Follow any specific instructions about changing the dressing.
• Pain management: mild soreness is normal and usually settles within a day or two. The care team will advise on suitable pain relief.
• Activity restrictions: strenuous exercise and heavy lifting are usually avoided for several days after a deep biopsy. For a simple skin biopsy, restrictions are usually minimal.
• Driving: patients who received sedation should not drive themselves home and should have someone with them for the rest of that day.
• Watch for warning signs: contact the hospital or care team promptly if there is increasing pain, swelling, redness, discharge from the wound, fever, or difficulty breathing.
• Stitches: if dissolvable stitches were not used, the care team will schedule a time for them to be removed, typically within one to two weeks.
• Results: pathology results usually take several days to about two weeks, depending on the complexity of the analysis. The doctor will arrange a follow-up appointment to discuss the findings and, if needed, the next steps in care.
• Lifestyle: once cleared by the doctor, returning to normal diet, exercise, and daily activities is encouraged. If the biopsy result leads to further treatment, the care team will give specific guidance at that stage.