Hematologist
CION Cancer Clinics
Repeat the bone marrow test, or review the slides you already have? | CION Cancer Clinics
If your first marrow sample was good enough, a second doctor reviewing the existing slides and wax block is usually the first step. A repeat bone marrow test is needed when that sample was too small or diluted, when tests need fresh living cells, or when time or treatment has changed things. This guide explains how to tell which applies, and what to ask your haematologist. At CION Cancer Clinics, our haematologist reviews abnormal blood reports with you, orders only the tests that answer your question and explains each result plainly.
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Medically reviewed by Dr. Basudev PokhrelConsultant Haematologist · last reviewed September 2026, next review due September 2027
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On this page
- Do you need a new bone marrow test, or can the old slides be checked again?
- How does a slide review compare with a repeat marrow test?
- Which situations point towards each choice?
- How do you get your existing slides reviewed?
- What do families often get wrong about this choice?
- Which words on a marrow report matter for this decision?
- What can neither route tell you on its own?
- Common questions about repeating a marrow test or reviewing slides
The short answer
Do you need a new bone marrow test, or can the old slides be checked again?
If the first marrow sample was good enough, a fresh review of the existing slides and block is usually the first step. A repeat bone marrow test is needed when the first sample was too small or too diluted, when a test needs fresh living cells, or when enough time has passed that the disease may have changed.
What the lab already holds
After a bone marrow test, the lab keeps glass slides of the liquid sample (the aspirate) and of the small core of bone (the trephine). The core is also set in a wax block. A second haematopathologist, a doctor who reads blood and marrow samples under the microscope, can look at these again. Extra stains can often be cut from the block without touching you.
What the old sample cannot give
Some tests need cells that are still alive. Flow cytometry, which sorts cells by the markers on their surface, and a full chromosome study both need a fresh sample. Slides and blocks cannot be turned back into living cells. If those results are missing or unclear, only a new sample fills the gap.
This page explains the choice. It cannot tell you which one your own case needs. Only a haematologist who has seen your reports can.Side by side
How does a slide review compare with a repeat marrow test?
Review of existing slides
Repeat bone marrow test
No new needle. The glass slides and wax block travel instead of you
A new aspirate and core taken from the hip bone under local numbing
Answers whether the first reading was right on the same material
Answers what the marrow looks like today
Extra stains possible on the block; no fresh flow cytometry or chromosome study
The full set of tests can be sent, including those needing living cells
Depends on the first lab releasing the material
Depends on your fitness for the procedure and your blood counts
Deciding
Which situations point towards each choice?
These are common patterns, not rules. Your haematologist weighs them against your symptoms, counts and treatment plan.
A review is often enough
The first sample was a good size and the question is about how it was read. The diagnosis sounds uncertain, or the subtype is not named clearly.
Often seen when
- You want a second opinion before treatment starts
- The report says "suggestive of" rather than a clear diagnosis
- Extra stains on the block could settle the question
A repeat test is usually needed
The report itself says the sample was not good enough, or key tests were never sent. No amount of re-reading adds cells that are not there.
Words on the report that hint at this
- "Dry tap", meaning no liquid marrow came out
- "Haemodilute", meaning mostly blood, little marrow
- "Inadequate" or "crushed" core
Time has moved on
The first test was done some months ago, or you have had treatment since. Old slides show the marrow as it was then. Checking how you have responded needs a sample from now.
Often both, in order
Many teams review the slides first, then decide on a repeat only for the tests still missing. This avoids a second needle when the review alone answers the question.
Not sure whether this applies to you?
Ask an oncologistWhat to do
How do you get your existing slides reviewed?
Collect the reports
Gather the marrow report, the flow cytometry and any chromosome or genetic reports, plus recent blood counts. Note the lab name and the sample number printed on each.
Ask for the material
Write to the first lab asking it to release the slides and block for review. A letter from the new haematologist usually helps. Labs keep the originals safe and often send recut slides.
Send it with the story
The reviewing doctor needs your history and counts, not just the glass. A slide read with no background is a weaker reading.
Decide on the gaps
Once the review is back, your haematologist tells you which questions are answered and whether a repeat test is still needed for the rest.
Commonly believed
What do families often get wrong about this choice?
"A new hospital always repeats the marrow test, so there is no point asking for slides."
Many centres start with the existing material, because it spares you a procedure. Bringing the reports and asking for the slides early gives the new team that option. Without them, repeating may be the only route left.
"If a second doctor reads the slides differently, the first lab made a mistake."
Marrow reading involves judgement, and some blood cancers look alike under the microscope. A different reading may reflect extra stains, more history or a narrower question. It points to a discussion between the doctors, not automatically to blame.
"A repeat test will give a clearer answer every time."
A repeat sample can also come out diluted or small. It helps most when there is a clear gap to fill. Repeating without a clear question can mean more pain and more waiting for the same uncertainty.
On your report
Which words on a marrow report matter for this decision?
- Aspirate
- The liquid part of the marrow drawn up with a syringe. It is spread on slides and used for flow cytometry and chromosome tests.
- Trephine or core biopsy
- A thin core of bone and marrow. It shows how full the marrow is and how the cells are arranged.
- Paraffin block
- The wax block holding the core. New thin slices and extra stains can be cut from it later.
- Immunohistochemistry (IHC)
- Stains that colour cells carrying particular markers. These can usually be added on an existing block.
- Cytogenetics
- A study of the chromosomes in marrow cells. The standard version needs fresh living cells grown in the lab.
Being straight with you
What can neither route tell you on its own?
Neither a review nor a repeat test gives an outlook on its own. The marrow result is one part of the picture. Your blood counts, scans, symptoms and general health all shape the plan, and a haematologist puts them together.
When the old material cannot be found
Sometimes slides are faded, broken or not released in time. If so, a repeat test may become the practical choice even when a review would have been enough. Ask the first lab early, and keep copies of every report you receive.
How CION approaches it
CION's haematology team, led by Dr. Basudev Pokhrel, looks at your reports and existing material first. Your case is presented to a tumour board, where several specialists review it together. The team then tells you whether a review is enough, and coordinates any further testing with qualified laboratories. You are told why a repeat is advised before it is done.
Who a repeat may not suit right now
If your platelets are very low, you are on a blood thinner, or you are unwell with an infection, the timing of a new marrow test needs care. Do not stop any medicine yourself. Tell the team, and they will plan around it.
Questions we are asked
Common questions about repeating a marrow test or reviewing slides
Can my old bone marrow slides be sent to another hospital?
Usually yes. Most labs will release slides or recut sections from the block when you or the new haematologist ask in writing. They often keep the original block and send fresh slices. Include your name, sample number and date of the test to speed things up. Allow some days for the lab to process the request.
Why did the new doctor say the old sample was not enough?
The first sample may have been mostly blood, too small, or missing tests that need living cells. It is not always anyone's fault; marrow can be hard to draw, especially when it is very full or scarred. The doctor is saying the question cannot be answered from the glass alone.
Is a repeat bone marrow test painful?
The skin and bone surface are numbed first. Most people feel pressure and a short, sharp pulling feeling when the liquid is drawn. The hip may ache for a few days. Tell the team if you were very anxious last time; extra support for pain and nerves can often be arranged.
Will a slide review delay my treatment?
It can add some days, mostly while the first lab releases the material. In fast-moving blood cancers, your haematologist may start treatment on the available results and let the review refine the plan. Ask directly whether waiting is safe in your case rather than guessing.
Can genetic tests be done on the old block?
Some can. Certain tests work on material from the wax block, though the acid used to soften bone can damage the genetic material. A standard chromosome study cannot, because it needs living cells. Your haematologist will say which tests the old sample can still support.
What if the two readings disagree?
The doctors usually talk to each other, look at the same slides together, or add stains to settle it. Sometimes a repeat sample is the only way to decide. Treatment is normally planned on the reading the tumour board agrees on, and the reason is explained to you.
Do I have to travel for a slide review?
No. For a review, the slides and block travel, not you. Families in Telangana and Andhra Pradesh districts often send the material by courier after the lab releases it. You will need a consultation to discuss the result, and that can be planned around your travel.
Is a review or repeat covered by Aarogyasri or insurance?
Cover depends on your scheme, your policy and whether the test is part of an approved treatment plan. Aarogyasri, CGHS, ECHS, EHS, PM-JAY and cashless insurance each have their own rules, and these change. Check the current rules with your scheme or insurer before the test.
Your Haematologist
Meet CION's haematologist. One specialist for your blood report and your plan.
Dr. Basudev Pokhrel reviews blood counts, transfusion needs and blood disorders, and works with the CION tumour board on blood cancers.
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Sources
- Cancer.Net — Bone Marrow Aspiration and Biopsy
- Cancer Research UK — Bone marrow test
- Leukemia & Lymphoma Society — Lab and imaging tests
- Cancer.Net — Seeking a Second Opinion
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Getting Slides Released for a Second OpinionHow to ask the first lab for your slides and blockWhen Two Haematology Reports DisagreeWhat happens when a review reads the marrow differentlyWhere Marrow Slides and Blocks Are StoredHow long labs keep material and who holds itHaematology Lab and Pathology QualityThe full guide to lab quality in blood cancer diagnosis
Talk to us
Not sure whether your marrow test needs repeating?
Share the reports you have. CION's haematology team will look at them and tell you whether a slide review, a repeat test or both makes sense.