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Sending Biopsy Slides — for a Review in Another City

Biopsy slides and tissue blocks can be sent by courier to any pathology department in India. The physical slides are the easier part. What most families miss is the clinical summary that must travel with them — without it, the reviewing pathologist is working in the dark.

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

  • Slides travel safely when packed correctly — Paraffin blocks are solid wax. Glass slides need a rigid mailer, which pathology departments use as standard.
  • Your treating hospital releases them — The pathology department holds your slides and blocks. They prepare and arrange dispatch — you do not need to handle the packing yourself.
  • Documents matter as much as the slides — A clinical summary, the original report, and a referral letter are what make the second opinion useful rather than just confirmatory.
  • Ask the receiving lab what format they need — Some prefer the paraffin block; others want freshly cut sections on new slides. Confirm before your pathology team prepares anything.
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Biopsy slides and paraffin-embedded tissue blocks travel by courier in a rigid, padded container. Your hospital's pathology department prepares and releases them. Along with the slides, send your original pathology report, your oncologist's referral letter, and a clinical summary explaining the specific question you need answered. Contact the receiving laboratory first to confirm exactly what they require.

Can the slides be damaged in transit?

Glass slides can crack if they are not placed in a rigid slide mailer before dispatch. Most hospital pathology departments use these as standard, so the risk in normal courier transit is low.

Paraffin-embedded tissue blocks are solid wax and are considerably more robust. They withstand normal handling well.

The more common problem is not physical damage. It is slides arriving without the documents the reviewing pathologist needs to give you a useful opinion. A second opinion without your original report and a clear clinical question is hard to act on.

How are slides sent to another city?

  1. Contact the receiving laboratory first

    Ask what format they need — some centres prefer the paraffin block so they can cut fresh sections; others accept pre-made glass slides. Confirm their postal address and whether they have a requisition form. Do this before your pathology team prepares anything.

  2. Get a referral letter from your oncologist

    The referral letter explains your diagnosis, the treatment being considered, and the specific question you want the reviewing pathologist to answer. Without a clear clinical question, the review is likely to be a general confirmation rather than a targeted one.

  3. Contact the pathology department at your treating hospital

    They hold your slides and blocks. Give them the receiving laboratory's address, any requisition form, and the format the lab has requested. They will prepare, package, and arrange dispatch.

  4. Prepare the documents to accompany the slides

    See the checklist below. These travel in the same package. Your name and date of birth must appear on every document and on the slide container itself.

  5. Use a courier with tracking

    The pathology department usually arranges this. If you are organising it yourself, choose a service that gives you a tracking number and delivers to the specific department rather than a general hospital reception desk.

  6. Confirm receipt with the receiving laboratory

    Call or email two to three days after dispatch to confirm the package has arrived and the material is adequate for review. This one step saves you a week of unnecessary uncertainty.

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What should you send with the slides?

  • Original pathology report — ask for a certified copy if the receiving lab requires one
  • Oncologist's referral letter stating the specific clinical question to be answered
  • Clinical summary: diagnosis, treatment being considered, and any relevant history
  • Relevant imaging reports — CT, MRI, or PET-CT that informed the biopsy or staging
  • Your name, date of birth, and contact number on every document and on the slide container
  • A return address — most centres return slides and blocks after the review is complete

Did you know?

A single paraffin-embedded tissue block can yield hundreds of sections. This means the block — not pre-made slides — is the most valuable material to send, because fresh sections cut from it give the reviewing pathologist the same quality of tissue the original laboratory had.

This is why specialist centres often prefer to receive the block, and why most pathology departments retain a portion of it even when sending material for outside review.

Source: Royal College of Pathologists: Tissue Pathways for Oncological Pathology

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Common questions

Frequently asked questions

Can I carry the slides to the other city myself rather than posting them?

Yes, and for shorter distances this is often more reliable than a courier. The pathology department will pack the slides and blocks in a rigid container for you to carry. Keep them at room temperature and do not place anything heavy on top of the package. Hand-carrying also means the material cannot be lost in transit, which matters when you are dealing with tissue that cannot be replaced.

Will the slides be returned after the review?

Most specialist centres return slides and blocks once the report is issued. Confirm this with the receiving laboratory before you send anything, and include your return address in the package. Returns can take several weeks after the report. If the block has been used to cut new sections, some material will have been consumed — that is unavoidable and expected — but a responsible laboratory will not exhaust a block without asking first.

What if the original block has already been used up?

If only a very small amount of tissue remains, the reviewing pathologist will work with what is available. Sometimes this means re-staining existing slides rather than cutting fresh sections. In situations where the material is genuinely insufficient, they will tell you clearly and explain whether further sampling is possible. It is worth discussing the remaining block size with your treating pathologist before arranging the review so that expectations are set before the package is sent.

How long does a pathology review take?

Turnaround varies by centre and by how complex the case is. A review of a common tumour type is generally faster than an assessment of a rare sarcoma or lymphoma subtype that requires additional staining or molecular testing. Ask the receiving laboratory for an estimate when you first contact them. Following up after dispatch — rather than waiting passively — is the most effective way to make sure delays do not go unnoticed.

What happens if the second opinion disagrees with the first?

A difference in pathology opinion is not a crisis — it is exactly the information you were seeking. Share both reports with your oncologist, who will decide how to proceed. In some cases a third review at a centre with specific expertise in that tumour type resolves the question. Treatment decisions are based on the full clinical picture, not a single report in isolation, and your oncologist is the right person to weigh a discrepancy and explain what it means for your care.

Full index

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