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Labs, Slides and Second Opinions — on a Biopsy

A biopsy diagnosis is one pathologist's reading of your tissue. That reading can be reviewed. Knowing how to request your slides, assess a laboratory, and handle a disagreement puts you in a position to act on your diagnosis with confidence.

Medically reviewed by Dr. C. Raghavendra Reddy, Medical Oncologist, MBBS (Gold Medal) · DNB · DM (Medical Oncology, Gold Medal) · Last reviewed September 2026

  • Your slides belong to you — The laboratory cannot refuse to release your biopsy slides. You own them.
  • The diagnosis is reviewable — Pathology is expert interpretation, not a machine output. A second pathologist can read the same tissue independently.
  • Expertise is subspecialised — A specialist in your tumour type may read the same slides differently from a general pathologist.
  • Disagreement is information — If two reports conflict, that tells you the diagnosis is genuinely difficult — and that matters for what happens next.
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A biopsy diagnosis is one pathologist's reading of your tissue, and that reading can be reviewed. To get a second opinion, request your original slides from the laboratory — they belong to you — and send them to a specialist pathologist. ESMO and ASCO guidance supports expert pathology review, particularly for rare or borderline diagnoses.

Why is a biopsy result not automatically final?

A biopsy diagnosis is a pathologist's interpretation of your tissue under a microscope. It is not a number generated by a machine. Interpretation requires judgement, and judgement can be reviewed.

Pathology is subdivided into narrow specialties. A pathologist who spends most of their time reading one tumour type — lymphoma, soft tissue sarcoma, bone tumours — will have seen the full range of how that tumour can present. That depth of experience can change how a difficult case is read.

Seeking a review is not an accusation against the first laboratory. For rare or borderline diagnoses, expert pathology review is standard clinical practice, referenced in guidance from both ESMO and ASCO.

How do you get your slides for a second opinion?

  • Contact the laboratory directlyYou do not need a referral from a doctor. Call or visit the pathology department and ask for your slides, paraffin block, and written report.
  • Request all related results at the same timeAsk for immunohistochemistry results and any molecular test reports alongside the main pathology report.
  • Confirm what the receiving pathologist needsSome prefer the paraffin block; others work from cut slides. Ask before you collect anything, so you do not make a second trip.
  • Handle slides carefullySlides are fragile and irreplaceable. Carry them in person or use a courier that handles biological specimens and provides tracking.
  • Send clinical context with the slidesInclude the biopsy site, the suspected or confirmed cancer type, and any prior treatment the patient has received.
  • Keep copies of everythingPhotograph or photocopy the original report before handing it over. The block and slides are originals that cannot be remade.

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How do you tell if a pathology laboratory is good enough for your case?

NABL accreditation — from the National Accreditation Board for Testing and Calibration Laboratories — is the first thing to check. It means the laboratory has been independently audited for equipment standards, process controls and staff qualifications. It is the baseline, not the ceiling.

Accreditation confirms process, not subspecialty depth. A NABL-accredited laboratory is not automatically the right choice for every tumour type. Ask whether the pathologist who will read your slides has experience with your specific diagnosis.

Volume is the other useful signal. A laboratory that regularly processes a high volume of a particular tumour type will have a pathologist who has seen the rarer presentations of it. Ask your oncologist which centre they refer difficult cases of your cancer type to — that answer is more useful than any ranking.

What do families most often ask about biopsy second opinions?

Who owns my biopsy slides?

You do. The tissue removed from your body belongs to you. The laboratory may charge a small handling fee to prepare and release the slides or block, but they cannot refuse to release them. If a laboratory says it cannot release your material, ask to speak to the pathologist or laboratory director and put the request in writing. Keep a record of all communications in case you need to escalate further.

What happens if the two reports disagree?

A disagreement does not mean one pathologist is right and one is wrong — it means the diagnosis is genuinely difficult, which is itself important information. Your oncologist will usually request a third opinion from a specialist centre or a tumour board review when reports conflict. In some cases the oncologist uses clinical findings and imaging alongside the pathology to reach a final decision. A conflict between two reports is a reason to seek more information, not a reason to panic.

Can a second opinion be done from digital images?

Yes. Some specialist centres accept high-resolution scanned images of your slides rather than the physical glass, which makes expert review — including from centres in other cities — far more accessible. Digital pathology review is accepted practice and is referenced in ESMO and ASCO guidance for remote expert consultation. Ask the receiving pathologist whether they accept digital submissions, what file format they need, and whether the scan quality from your laboratory meets their standard.

Will a second opinion delay my treatment?

For most diagnoses, a pathology review takes one to two weeks, and that window does not materially change outcomes. For genuinely urgent diagnoses — where treatment needs to begin within days — your oncologist will tell you so directly, and you can make an informed decision in that context. Do not skip a second opinion solely to avoid delay without first asking your oncologist whether the delay is clinically significant for your specific situation. That is a reasonable question to ask, and it has a direct answer.

How do I find a specialist pathologist for my tumour type?

Your treating oncologist is the best starting point — they will know which centres have subspecialty depth in your diagnosis. Academic cancer centres and tertiary hospitals attached to medical colleges generally have more specialised pathology departments than standalone diagnostic laboratories. Your oncologist at a CION centre can help identify the right specialist and assist with sending the appropriate clinical context alongside the slides. For rare tumour types, an international review may be the most useful option.

Do I need to tell my doctor I am getting a second opinion?

You do not need permission, but telling your oncologist is usually helpful. Most oncologists welcome a review — particularly for rare or borderline diagnoses — and can help by ensuring the right clinical information accompanies the slides. If you prefer to arrange it independently, that is entirely your right. Collect the slides yourself, arrange the review, and share the result with your oncologist when you have it. The two opinions together give your treating team more to work with.

Did you know?

Expert pathology review — a second pathologist independently reading your slides — changes the diagnosis or the grade in a proportion of cancer cases that most patients would find surprising.

In tumour types where tissue appearances are most variable, such as soft tissue sarcomas and some lymphomas, review alters the management plan in a substantial minority of cases. The single action that makes review possible is requesting your slides.

Source: ESMO and ASCO clinical practice guidance on expert pathology review in oncology diagnosis

Explore 112 more Markers, Molecular Testing and Test Accuracy topics

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HUB — IHC and Molecular Markers on a Biopsy

All Markers, Molecular Testing and Test Accuracy →

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Common questions

Frequently asked questions

How do I get a second opinion on a biopsy in India?

Request your slides directly from the laboratory that processed your biopsy — you do not need a doctor's referral to do this. Ask for the paraffin block or cut slides, the written pathology report, and any immunohistochemistry or molecular test results. Your treating oncologist can help identify a specialist pathologist or centre with experience in your tumour type. Some centres accept digital images if you cannot transport the physical slides, which makes the process considerably more practical.

Who pays for a second pathology opinion?

A second opinion is usually paid out of pocket, as it is not a decision made by the primary treating team. The cost varies by centre and by how much additional testing the reviewing pathologist orders. Some insurance policies cover second opinions — check your policy before assuming you will pay for it yourself. Weigh the cost against what is at stake: confirming a diagnosis before committing to a treatment that may last months is generally a proportionate use of money.

Can I send my slides to a pathologist abroad?

Yes. International second opinions are possible, and for rare tumours they can be the most useful option when the number of specialists with deep experience in a particular diagnosis is small globally. Digital pathology has made international review far more accessible — some major cancer centres accept high-resolution scanned images, which avoids the delay and risk of an international courier. Ask the receiving centre what format they accept and whether they need clinical information alongside the images.

What is the difference between a paraffin block and a slide?

The paraffin block is the original specimen — your tissue, embedded in wax and preserved. Thin slices are cut from the block, mounted on glass, and stained to create the slides that the pathologist reads under a microscope. The block is the master copy. New slides can be cut from the block if needed, but the block itself cannot be recreated if it is lost or damaged. This is why most laboratories prefer to retain the block and release only slides, and why both should be handled with care.

What does NABL accreditation mean for a pathology lab?

NABL is the national body that independently audits Indian laboratories against defined standards for equipment, processes, staff qualifications and quality controls. Accreditation means the laboratory has passed that audit and agreed to periodic re-review. It is a meaningful baseline — stronger assurance than no accreditation — but it does not guarantee subspecialty depth for every tumour type. NABL accreditation is the minimum to look for; whether the pathologist reading your slides has specific experience with your cancer is the next question.

Should I get a second opinion before starting chemotherapy?

For most cancer diagnoses, yes — particularly if you have any doubt about the diagnosis, the tumour type is rare, or the treatment proposed is intensive. Starting chemotherapy on an incorrect diagnosis exposes you to side effects with no benefit. A second opinion on pathology takes one to two weeks in most cases, and for most diagnoses that window does not change your outcome. Ask your oncologist directly whether your situation is one where urgent treatment matters more than confirmation — they can answer that, and it is a reasonable question to raise.

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?

What Is a Biopsy? Everything You Need to Know →

Types of Biopsy Compared

Which Biopsy Will You Have? Techniques Compared →

Preparing for a Biopsy

What to Expect on the Day of Your Biopsy →

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

How to Read a Biopsy Report: Terms Explained →

IHC and Molecular Markers

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

Grading and Scoring Systems

Cytology & Prostate Scoring Systems Explained →

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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