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Biopsy procedures

Fine Needle Aspiration — vs Fine Needle Biopsy

Your report may say FNAC, FNA, or FNB, and the difference matters. FNA collects loose cells; FNB collects a small piece of tissue. They are read differently by the laboratory, and they answer different questions for your doctor.

Medically reviewed by Dr. Muralidhar Muddusetty, Surgical Oncologist, MBBS (AIIMS) · MS Surgery (AIIMS) · DNB Surg Onc · MRCS (Edinburgh) · Last reviewed September 2026

  • Not always the same thing — FNA and FNB use different needles and produce different types of sample, even though Indian reports sometimes treat the terms as equivalent.
  • The needle is different — FNA uses a standard thin needle with a syringe and suction. FNB uses a specially designed needle built to cut and hold a sliver of tissue.
  • The sample is different — FNA gives loose cells read as a cytology result. FNB gives a small tissue core read as a histology result.
  • The choice belongs to your doctor — Which procedure you have depends on where the lump is, how it can be safely reached, and what the laboratory needs to know to diagnose you.
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FNA and FNB are not the same, though Indian reports often use both terms loosely. FNA uses suction to collect loose cells for cytology. FNB uses a specially designed needle to collect a small tissue core for histology. Your doctor chooses between them based on what information they need and where the lump is.

How do FNA and FNB compare?

FNA — Fine Needle AspirationFNB — Fine Needle Biopsy
What the needle doesSuction draws loose cells into the needleThe needle cuts and holds a sliver of tissue — no suction
Type of needleStandard thin needle attached to a syringeSpecially designed needle with a side-cut or reverse-bevel tip
What the sample containsIndividual cellsA small core or strip of tissue
Laboratory report typeCytology (often written as FNAC)Histopathology
What it can showWhether cells look cancerous or benignCancer type, grade, and protein markers needed for treatment planning
Common locationsThyroid nodules, neck lumps, lymph nodes, breastLiver, pancreas, lung, and deep lesions via endoscopy or CT guidance
Additional testing on sampleLimited — cells may not be enough for IHCImmunohistochemistry and molecular testing usually possible

Why do Indian reports use both terms for the same test?

FNAC has been the standard term in Indian pathology for decades, and many laboratories still write it on reports even when the needle collected a tissue core rather than loose cells.

FNB became a distinct term as newer needles were developed for endoscopic ultrasound, where collecting a tissue core matters more than collecting loose cells. The distinction grew important because the two types of report answer different questions.

If you want to know which was done to you, the report itself will tell you: a cytology result means FNA; a histopathology result means FNB or a core biopsy.

What will this actually cost you?

Costs depend on the regimen, the number of cycles and your scheme eligibility. Send your reports and we will give you an itemised, indicative estimate.

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What do the words on your biopsy report mean?

FNAC
Fine Needle Aspiration Cytology — the standard Indian term for FNA. The sample is loose cells, not tissue. The result is a cytology report, not a histopathology report.
Cytology
The study of individual cells under a microscope. This is what FNA produces. It can often show whether cells look normal, suspicious, or cancerous, but cannot always show how those cells are arranged within the tissue.
Histopathology
The study of tissue structure under a microscope. This is what FNB produces. It shows how cells are arranged, which is needed to classify many cancers precisely and plan treatment.
Immunohistochemistry (IHC)
A test run on tissue — not just cells — to identify specific proteins on cancer cells. IHC is usually possible after FNB. After FNA, there may not be enough material to run it.
Inadequate sample
A laboratory term meaning there was not enough material to give a reliable result. It does not mean cancer was found. It usually means the procedure needs to be repeated, sometimes with a different needle or technique.

Which procedure will you have?

Your oncologist or radiologist decides. The choice depends on where the lump is, how deep it is, and what the report needs to show.

For a thyroid nodule or a lymph node close to the skin, FNA is usually sufficient. For a mass in the liver, pancreas, or lung that can only be reached through endoscopy or CT guidance, FNB is often preferred because the tissue core gives more information for treatment planning.

Sometimes both are done in the same sitting. If the first sample is not enough, a different needle or technique may be used. Ask your doctor which type of report to expect and what it will be able to tell them — that question is always reasonable to ask.

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Common questions

Frequently asked questions

Is FNAC the same as FNA?

Yes. FNAC stands for Fine Needle Aspiration Cytology, which is simply the full name for FNA with the word cytology added to describe what the laboratory does with the sample. FNAC is the more common term on Indian reports; FNA appears more often on international ones. Both mean a fine needle with suction was used to collect loose cells, which were then read by a cytologist. Neither involves collecting a tissue core — that is FNB or a core biopsy.

Is a fine needle biopsy painful?

Most people describe it as a sharp pinch — similar to a blood test — rather than significant pain. Local anaesthetic cream or an injection is sometimes used first, particularly for deeper sites. For procedures that reach a deep location such as the pancreas via endoscopy, sedation is usually given. Any discomfort tends to settle quickly afterwards. If you are anxious about the procedure, tell the radiologist or endoscopist beforehand — they can take steps to make it more comfortable.

What does it mean if the report says the sample was inadequate?

It means the laboratory did not receive enough material to give a reliable result. It does not mean cancer was found, and it is not a reflection of anything being wrong with your health. It usually means the procedure needs to be repeated, sometimes with a different needle or technique. This happens with both FNA and FNB and is more common when the site is difficult to reach. Your doctor will explain whether a repeat is needed and what kind.

Can a fine needle test miss a cancer?

Yes, it is possible, and this is one of the factors your doctor weighs when choosing between FNA and FNB. FNA in particular can return a benign or inconclusive result even when a cancer is present, because individual cells do not always show the full picture that tissue architecture can. This is why FNB or a core biopsy is often preferred when deeper lesions need to be characterised. If your symptoms continue or worsen after a benign result, tell your team — a repeat biopsy or a different type may be warranted.

Will I need a second biopsy after FNA?

Sometimes. A second biopsy may be needed if the first sample was inadequate, if the result was inconclusive, or if treatment planning requires more tissue — for example, for immunohistochemistry or molecular testing, which FNA often cannot provide enough material for. If FNA was done first and the result is not enough to plan treatment, FNB or a core biopsy may be requested as a follow-up. Your oncologist will tell you clearly whether your result is sufficient or whether more tissue is needed.

How long do FNA and FNB results take?

FNA cytology results typically come back faster than FNB histopathology results. FNB requires the tissue to be processed, embedded, cut into thin sections, and stained before the pathologist reads it — which takes more steps than reading loose cells. If immunohistochemistry testing is also requested, it adds further time. The laboratory or diagnostic centre will give you a specific timeline when the procedure is done. If the result has not arrived when expected, contact the laboratory or your doctor's office directly rather than waiting.

Full index

Browse all 701 biopsy topics

Every page in this section, grouped by the part of the journey it belongs to. Pick a group to see what is in it.

What Is a Biopsy?

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Types of Biopsy Compared

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Preparing for a Biopsy

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Recovery and Aftercare

After a Biopsy: Recovery, Aftercare and Warning Signs →

Biopsy by Body Part

Biopsy by Body Part: What to Expect at Each Site →

Understanding Your Report

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IHC and Molecular Markers

IHC and Molecular Markers on a Biopsy: What They Mean →

Grading and Scoring Systems

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How Accurate Is a Biopsy?

How Accurate Is a Biopsy? Errors and Second Opinions →

If Your Result Is Benign

Your Biopsy Is Benign: What It Means and What Comes Next →

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