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Bone marrow testing

Why Is a Bone Marrow — Biopsy Needed?

A bone marrow biopsy is ordered when blood test results cannot be explained without looking at the source. The most common reasons are unexplained anaemia, low blood counts, and suspected blood disorders — and many of those are not cancer.

Medically reviewed by Dr. Bharati Devi Gorantla, Medical Oncologist, MBBS · MD · DM (Adyar, Chennai) · ECMO · MRCP SCE (UK) · Last reviewed September 2026

  • Not always cancer — Many biopsies are ordered for anaemia or persistently low counts, not because cancer is suspected.
  • Blood cells start here — The marrow is the factory where red cells, white cells, and platelets are made. The test examines that factory directly.
  • Two samples, one procedure — A liquid aspirate and a solid core are taken in the same sitting — each answers a different question.
  • Results go to a specialist — A haematologist receives and interprets the findings and discusses them with you at your next appointment.
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A bone marrow biopsy is ordered when blood test results cannot be explained without examining the marrow directly. The most common reasons are unexplained anaemia, low blood counts, and suspected blood disorders. It is not always cancer. The test looks for what cells the marrow is producing, whether they are maturing normally, and whether abnormal cells are present.

What do words like trephine and aspirate mean?

Bone marrow
The soft tissue inside large bones — the pelvis, breastbone and thigh bone — where red cells, white cells and platelets are continuously produced.
Haematologist
The specialist who orders and interprets bone marrow biopsy results. All findings are routed to them first; they discuss the results with you at your next appointment.
Aspirate
The liquid component drawn from the marrow during the procedure. Under a microscope it shows what cell types are present and whether they are maturing normally.
Trephine core
A small solid cylinder of marrow tissue taken alongside the aspirate. It shows how the marrow is organised — whether it is overcrowded, underactive, or infiltrated by abnormal cells.
CBC (complete blood count)
The routine blood test whose unexplained abnormal results — low haemoglobin, low platelets, or unusual white cell counts — most often prompt the decision to order a biopsy.

Which conditions lead a doctor to order this test?

The most common trigger is a blood test that shows something abnormal without a clear cause — most often unexplained anaemia, a very low platelet count, or a white cell count that is persistently too high or too low.

A fever lasting weeks without any identified source is another reason, particularly when blood tests suggest the marrow may be involved.

The test is also ordered when someone has already been diagnosed with a blood disorder and the doctor needs to understand how far it has progressed, or how well treatment is working.

Non-cancerous conditions — including aplastic anaemia, certain infections, and vitamin deficiencies that have not responded to treatment — are among the reasons a biopsy is ordered.

Is a bone marrow biopsy always for cancer?

No. Many people who have this test are found to have a condition that is not cancer.

Non-cancerous findings include aplastic anaemia, where the marrow stops producing cells normally; anaemia caused by iron, B12 or folate deficiency that resists treatment; infections such as tuberculosis that involve the marrow; and certain storage disorders.

A biopsy is ordered whenever blood results cannot be explained any other way. If your doctor has referred you for one, it does not mean they believe you have cancer — it means this is the only reliable way to answer the question your blood tests have raised.

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What is the test actually looking for inside the marrow?

The laboratory examines the sample for three things: whether the right types of cell are being produced, whether those cells are maturing normally, and whether any cells that should not be there are present.

In blood cancers, the biopsy can show whether abnormal cells have crowded out the space normal cells need — and what proportion of the marrow they have taken over.

In non-cancerous conditions it shows whether the marrow is underperforming or whether something is blocking normal production.

The results tell your haematologist not only what is wrong but how far along the condition is, which shapes the treatment recommendation directly.

Questions about the biopsy and what follows

Why cannot a blood test alone answer this question?

Blood tests show what is circulating, not what is being produced. A low red cell count tells your doctor that fewer cells are reaching the bloodstream than you need, but it cannot tell them whether the marrow is making too few, destroying them early, or being crowded out by abnormal cells. The bone marrow biopsy goes directly to the source and answers that question in a way no blood test can.

What is the difference between an aspirate and a trephine biopsy?

Both are taken in the same procedure and from the same site. The aspirate is a small amount of liquid marrow drawn through a needle — it is used to examine individual cells under a microscope. The trephine is a narrow solid core of marrow tissue taken with a slightly wider needle — it shows how the marrow is organised overall. Both are needed because each provides different information, and a result from one alone would be incomplete.

What happens to the sample after it is taken?

The sample goes to a pathology laboratory where it is processed, stained and examined under a microscope by a pathologist, and then reviewed by your haematologist. For suspected blood cancers or complex conditions, additional genetic and molecular studies may be run on the same sample. These can take longer than the initial microscopy result. Your haematologist will tell you which tests have been ordered and when results are expected.

Can the results come back completely normal?

Yes. A normal bone marrow biopsy result is informative — it tells your haematologist that the marrow is not the source of the problem, which guides investigation elsewhere. It is not a wasted test. In some conditions, ruling out a marrow cause is as clinically important as identifying one, because it changes the direction of the entire workup.

How long do results take?

Initial microscopy results are usually available within a few days to a week. If genetic or molecular studies are ordered — which is common when a blood cancer is being investigated — those results can take two to three weeks. Ask your haematologist at your follow-up what tests were run and when the full report will be ready, so you are not left without a clear timeline.

Who will explain the results to me?

Your haematologist receives and interprets the results and will discuss them with you at your next appointment. Results of this significance are not delivered over the phone. If the wait feels too long once results are ready, ask your care team whether an earlier appointment is possible — it is a reasonable thing to ask and the team will try to accommodate it.

Did you know?

Your bone marrow produces many billions of blood cells every day. The biopsy sample is smaller than a grain of rice — and that is enough for the laboratory to detect abnormal cells present in very low numbers.

This sensitivity is why the biopsy remains the standard investigation for blood disorders when blood tests alone leave the picture incomplete.

Source: American Society of Clinical Oncology (ASCO)

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Common questions

Frequently asked questions

Why did my doctor order a bone marrow biopsy when my blood test was only slightly abnormal?

Even a mild or borderline abnormality in a blood count can be the first sign of a condition that needs to be identified early to be managed well. Blood tests show the end result of what the marrow is doing — the biopsy shows why. Some conditions that look mild on a blood test are already significantly advanced inside the marrow. Your doctor is not necessarily alarmed; they are being thorough.

Does being referred for a bone marrow biopsy mean I have leukaemia or another blood cancer?

No. A bone marrow biopsy is ordered for a range of conditions, many of which are not cancer. Unexplained anaemia, aplastic anaemia, infections involving the marrow, and vitamin deficiency that has not responded to treatment are all non-cancerous reasons this test is done. The biopsy is the way to find out what is happening — the referral itself does not tell you the answer.

Can a bone marrow biopsy detect infections as well as cancer?

Yes. Certain infections — including tuberculosis and some fungal infections — can involve the bone marrow and are sometimes only reliably diagnosed by examining the marrow directly. In people with prolonged unexplained fever and abnormal blood counts, infection is one of the first possibilities the biopsy helps to investigate or rule out.

Do I need to be admitted to hospital for a bone marrow biopsy?

Usually not. The procedure is typically done as day care — you come in for the procedure and go home the same day. You will need someone with you to take you home afterwards. Your care team will give you specific instructions about what to eat or drink beforehand and how to look after the site once you are home.

What if the sample taken is not enough for a diagnosis?

This does occasionally happen, most often when the marrow is unusually compact or the cells do not draw well into the aspirate. In that situation your haematologist may ask for the procedure to be repeated, sometimes from a different site. It is frustrating, but it is a technical limitation of the sample rather than a sign that something worse has been found.

Can I ask for a second opinion on the bone marrow biopsy result?

Yes, and it is a reasonable request for any significant test. Bone marrow biopsy interpretation requires specialist training, and in complex cases a second pathologist reviewing the same slides is a normal part of reaching the right diagnosis. Your haematologist can arrange for the slides to be reviewed at another centre. You do not need to repeat the procedure to get a second opinion on the result.

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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