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CION Cancer Clinics
Do you still need a bone marrow biopsy if a PET-CT is done? | CION Cancer Clinics
Often not, but it depends on the lymphoma. In Hodgkin lymphoma and most diffuse large B-cell lymphomas, a good staging PET-CT usually shows marrow spread well enough to skip the biopsy. In follicular, mantle cell and other lymphomas that take up little sugar, the marrow sample is still commonly advised. The deciding question is whether the result would change your stage or treatment. At CION Cancer Clinics, our haematology team plans myeloma and lymphoma care with you, discussed at a tumour board and explained in plain words.
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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
- If a PET-CT is done, is a bone marrow biopsy still needed?
- How does the decision usually differ by lymphoma type?
- When does PET-CT usually settle it, and when does it not?
- What happens during a bone marrow biopsy?
- What do families often believe about the marrow test?
- What should you ask, and what can this page not decide?
- Which words will you see on the marrow report?
- Common questions about marrow biopsy and PET-CT
The short answer
If a PET-CT is done, is a bone marrow biopsy still needed?
Often not, but it depends on the type of lymphoma. In Hodgkin lymphoma and in most diffuse large B-cell lymphomas, a good-quality PET-CT usually shows marrow involvement well enough that a marrow biopsy can be skipped. In slow-growing and some other lymphomas, the marrow biopsy is still commonly advised.
Why the two tests overlap
A PET-CT shows areas of the body that use sugar quickly, and many lymphomas do. When lymphoma has spread into the bone marrow, the soft tissue inside the bones, those areas can light up on the scan. A bone marrow biopsy takes a small sample from the back of the hip bone and looks at it directly under the microscope.
Why the answer is not the same for everyone
Some lymphomas take up sugar strongly, so the scan sees them clearly. Others take up very little, or spread through the marrow in a thin, scattered way the scan can miss. For those lymphomas, only the sample can tell. The decision also depends on whether the result would change your treatment.
The question to ask is not "which test is better" but "would a marrow result change my plan".By lymphoma type
How does the decision usually differ by lymphoma type?
These are the usual patterns. Your haematologist may advise differently for good reasons in your own case.
Hodgkin lymphoma
PET-CT is very good at picking up marrow spread here. When the staging PET-CT is done well, a routine marrow biopsy is generally no longer needed.
Diffuse large B-cell lymphoma
If the PET-CT clearly shows marrow involvement, the stage is already set and a biopsy adds little. If the scan looks clear, a biopsy may still be offered.
When it is still asked for
- The result would change the stage or plan
- A second, slower lymphoma is suspected
Follicular and other slow-growing lymphomas
These can sit in the marrow without lighting up on the scan. A marrow biopsy is still commonly used to complete staging, especially when treatment choices depend on the result.
Mantle cell, T-cell and rarer types
Marrow involvement is common in several of these, and PET-CT uptake varies. A marrow biopsy is often part of standard staging, sometimes with flow cytometry on the sample.
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When does PET-CT usually settle it, and when does it not?
PET-CT is often enough
A marrow biopsy is often still advised
The lymphoma takes up sugar strongly
The lymphoma takes up little sugar
The scan already shows clear marrow spots
The scan looks clear, but the result would change the plan
Blood counts are normal
Blood counts are low for no other clear reason
The stage is already advanced for other reasons
A clinical trial or specific treatment needs marrow status
If you do need one
What happens during a bone marrow biopsy?
Before the test
Tell the team about any blood thinners, bleeding problems or allergies. Do not stop any medicine on your own; the team will tell you what, if anything, to change. You can usually eat normally.
Numbing the area
You lie on your side or front. The skin over the back of the hip bone is cleaned and numbed with an injection. Some people are also given a mild sedative to feel calmer.
Taking the samples
A needle draws out liquid marrow, which can cause a brief deep ache or pulling feeling. A small core of bone is then taken. The whole procedure usually takes under half an hour.
Going home
You rest briefly and can usually go home the same day. The site may be sore for a few days. Report any bleeding that soaks the dressing, or a fever, to your team.
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Commonly believed
What do families often believe about the marrow test?
"A marrow biopsy means the doctors think it has spread."
Not necessarily. It is often ordered to complete staging, simply so the stage is accurate. Being asked for one is not a sign that the team expects a bad result.
"The needle goes into the spine."
It does not. The sample comes from the back of the hip bone, well away from the spinal cord. There is no risk of paralysis from this test.
"If PET was done, the marrow test is just extra money."
For some lymphomas that is true, and your team may skip it. For others, the scan can miss marrow spread that changes the stage and the treatment. Ask which applies to your type.
"A clear marrow means the lymphoma is early."
A clear marrow rules out one site only. Stage also depends on which lymph node areas and organs are involved, which the scan shows.
Being straight with you
What should you ask, and what can this page not decide?
This page cannot tell you whether you need a marrow biopsy. That depends on the exact subtype on your biopsy report, the quality and findings of your PET-CT, your blood counts and the treatment being considered. Your haematologist weighs all of these together.
Three questions that help
First, would the marrow result change my stage or my treatment? Second, does my type of lymphoma usually show up well on PET-CT? Third, are my blood counts explained, or could the marrow be involved? Clear answers to these usually make the decision obvious to you as well.
Where the test is done
CION's haematology team reviews the biopsy report, PET-CT and blood tests, and presents the case at a tumour board. If a marrow biopsy is needed, the team tells you where it will be done and coordinates the sample and report, so the result comes back to the doctors planning your care.
Ask for copies of both the aspirate report and the trephine report. They are two separate parts of the same test.On your report
Which words will you see on the marrow report?
- Aspirate
- The liquid part of the marrow, drawn up through the needle and spread on slides.
- Trephine
- The small core of bone and marrow. It shows how the cells are arranged, which the liquid sample cannot.
- Infiltration
- Lymphoma cells have been found in the marrow. The report may say how much and in what pattern.
- No evidence of involvement
- No lymphoma was seen in the sample taken. It is reassuring, though a small sample cannot rule out every spot.
- Flow cytometry
- A machine test that counts cells carrying lymphoma markers in the liquid sample.
Questions we are asked
Common questions about marrow biopsy and PET-CT
Does a bone marrow biopsy hurt?
The skin and bone surface are numbed, so the needle going in is usually felt as pressure. Drawing out the liquid marrow can cause a short, deep ache that the numbing cannot fully block. It lasts seconds. Afterwards the area may feel bruised for a few days, and simple pain relief advised by your team usually helps.
My PET-CT showed bright spots in the bones. Is that lymphoma?
It may be, and in some lymphomas a clear pattern is enough to count as marrow involvement. But bright bone spots can also come from inflammation, healing fractures or recent medicines that stimulate the marrow. Your haematologist reads the pattern with your blood counts before deciding whether a biopsy is needed.
My scan is clear. Why do they still want a marrow sample?
Because some lymphomas spread through the marrow thinly and do not light up on PET-CT. If your type of lymphoma is one of these, or if your blood counts are low, a sample is the only way to know. Ask how the result would change your stage or treatment.
Can the marrow biopsy delay treatment?
It can add some days while the sample is processed. In fast-growing lymphoma, your team may start treatment while waiting if the result will not change the first steps. Ask whether the plan depends on the result, and how long the report usually takes.
Is a marrow biopsy safe for older parents?
It is a common test in older adults and serious problems are uncommon. Bleeding risk is higher in people on blood thinners or with very low platelets, so the team checks these first. Tell them about every medicine your parent takes, including ones for the heart.
Will I need another marrow biopsy after treatment?
Only in some cases. If the marrow was involved at the start and the scan cannot show whether it has cleared, a repeat sample may be advised to confirm the response. Many people with lymphoma never need a second one.
Can I refuse the marrow biopsy?
You can, and you should say so openly. Before you decide, ask what the team would lose by not having the result. For some lymphomas very little changes. For others, the stage and treatment could be set wrongly, which matters more than the discomfort of the test.
Does Aarogyasri or insurance cover this test?
When a marrow biopsy is part of an approved lymphoma work-up, schemes such as Aarogyasri, CGHS, ECHS, EHS and PM-JAY, and most cashless insurers, often cover it. Scheme rules change, so check the current rules with the helpline before the test.
Your Haematologist
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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
- National Cancer Institute — Adult Hodgkin Lymphoma Treatment (PDQ)
- National Cancer Institute — Adult Non-Hodgkin Lymphoma Treatment (PDQ)
- NICE — Non-Hodgkin's lymphoma: diagnosis and management (NG52)
- Cancer Research UK — Hodgkin lymphoma
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
Staging Scans: How Many and How OftenThe full list of staging tests and when each is repeatedLugano Classification and Response CriteriaHow marrow involvement changes the stagePET-CT scan guideWhat the scan shows and how to prepareLymphoma Diagnosis and StagingThe whole diagnostic pathway in one place
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Share your biopsy report and PET-CT with us. CION's haematology team will review them and explain what staging still needs to be done.