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Bone marrow test symptoms. Bone Marrow Test: Purpose, Procedure, and What to Expect

What is a bone marrow test. How is a bone marrow biopsy performed. Why might a doctor recommend a bone marrow aspiration. What are the potential side effects of a bone marrow biopsy. How long does it take to get bone marrow test results.

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Understanding Bone Marrow and Its Importance

Bone marrow is the spongy tissue found inside our bones, responsible for producing blood cells. It plays a crucial role in our body’s immune system and overall health. A bone marrow test, also known as a bone marrow biopsy or aspiration, is a medical procedure that allows doctors to examine the cells within this vital tissue.

The Function of Bone Marrow

Bone marrow serves as the factory for our blood cells, producing:

  • Red blood cells (erythrocytes) that carry oxygen throughout the body
  • White blood cells (leukocytes) that fight infections
  • Platelets (thrombocytes) that help with blood clotting

Given its importance, any abnormalities in bone marrow function can have significant implications for a person’s health.

The Purpose of Bone Marrow Tests

Bone marrow tests are typically performed to diagnose or monitor various conditions, particularly blood disorders and certain types of cancer. They provide valuable information about the health and function of bone marrow cells.

Common Reasons for Bone Marrow Tests

Doctors may recommend a bone marrow test for several reasons:

  1. To diagnose blood cancers such as leukemia, lymphoma, or multiple myeloma
  2. To determine the stage or progression of a known cancer
  3. To evaluate the effectiveness of cancer treatments
  4. To investigate unexplained abnormalities in blood cell counts
  5. To diagnose certain non-cancerous conditions affecting blood cell production

Are bone marrow tests only used for cancer diagnosis? While cancer detection is a common reason for bone marrow tests, they are also valuable in diagnosing non-cancerous conditions such as anemia, infections, and bone marrow disorders.

Types of Bone Marrow Tests

There are two main types of bone marrow tests: aspiration and biopsy. Often, both procedures are performed during the same appointment to provide a comprehensive evaluation of the bone marrow.

Bone Marrow Aspiration

In a bone marrow aspiration, a thin needle is used to withdraw a small amount of liquid bone marrow. This sample contains loose cells that can be examined under a microscope.

Bone Marrow Biopsy

A bone marrow biopsy involves removing a small core of bone along with the marrow inside. This provides information about the structure and cellularity of the bone marrow.

Can bone marrow tests be performed separately? While it’s common to have both tests done together, in some cases, a doctor may only need to perform one or the other depending on the specific diagnostic requirements.

The Bone Marrow Test Procedure

Understanding what to expect during a bone marrow test can help alleviate anxiety and prepare patients for the procedure.

Before the Test

Prior to the procedure:

  • Your doctor will explain the process and ask you to sign a consent form
  • You may need to change into a hospital gown
  • You’ll be positioned on your side with your knees drawn up to your chest

During the Test

The actual procedure involves several steps:

  1. The area (usually the hip bone) is cleaned with antiseptic
  2. Local anesthetic is injected to numb the area
  3. A thin needle is inserted through the skin and into the bone
  4. For aspiration, a syringe is used to withdraw liquid bone marrow
  5. For biopsy, a larger needle removes a small core of bone and marrow

How long does a bone marrow test take? The entire procedure typically lasts about 30 minutes, with the actual sampling taking only a few minutes.

Potential Side Effects and Recovery

While bone marrow tests are generally safe, like any medical procedure, they can have some side effects.

Common Side Effects

Patients may experience:

  • Bruising at the biopsy site
  • Mild pain or discomfort for a few days
  • Slight bleeding from the biopsy site

Rare Complications

In rare cases, more serious complications can occur:

  • Infection at the biopsy site
  • Prolonged bleeding
  • Allergic reaction to the local anesthetic

Is there a risk of bone damage from the procedure? The risk of bone damage is extremely low. The needles used are specifically designed to minimize any risk to the bone structure.

Interpreting Bone Marrow Test Results

After the procedure, the collected samples are sent to a laboratory for analysis. A pathologist examines the samples under a microscope to evaluate the bone marrow cells and structure.

What the Results Can Show

Bone marrow test results can provide information about:

  • The presence of abnormal cells, such as cancer cells
  • The number and types of blood-forming cells
  • The overall health and function of the bone marrow
  • The presence of iron stores in the bone marrow

How long does it take to get bone marrow test results? Results are typically available within 1 to 2 weeks, although this can vary depending on the specific tests being performed.

Preparing for a Bone Marrow Test

Proper preparation can help ensure a smooth procedure and accurate results.

Before the Test

To prepare for a bone marrow test:

  • Inform your doctor about any medications or supplements you’re taking
  • Discuss any allergies, especially to local anesthetics
  • Arrange for someone to drive you home after the procedure
  • Follow any specific instructions provided by your healthcare team

On the Day of the Test

On the day of your bone marrow test:

  • Wear comfortable, loose-fitting clothing
  • Eat normally unless instructed otherwise
  • Arrive at the hospital or clinic as directed

Should you fast before a bone marrow test? In most cases, fasting is not required for a bone marrow test. However, always follow the specific instructions provided by your healthcare provider.

Alternatives and Complementary Tests

While bone marrow tests provide unique and valuable information, they are often used in conjunction with other diagnostic tools.

Related Blood Tests

Other tests that may be performed alongside or instead of a bone marrow test include:

  • Complete blood count (CBC)
  • Peripheral blood smear
  • Flow cytometry
  • Genetic testing of blood cells

Imaging Studies

In some cases, imaging studies may be used to complement bone marrow tests:

  • X-rays
  • CT scans
  • MRI scans
  • PET scans

Can imaging studies replace bone marrow tests? While imaging studies can provide valuable information, they cannot directly examine bone marrow cells at a microscopic level. Therefore, they often complement rather than replace bone marrow tests.

Bone marrow tests play a crucial role in diagnosing and monitoring various blood disorders and cancers. By providing a direct look at the cells within the bone marrow, these tests offer invaluable information that helps guide treatment decisions and assess patient outcomes. While the procedure may cause some discomfort, it is generally safe and well-tolerated by most patients. As medical technology advances, we may see new, less invasive methods for examining bone marrow function, but for now, bone marrow aspiration and biopsy remain essential tools in hematology and oncology.

Understanding the purpose, procedure, and potential outcomes of bone marrow tests can help patients feel more prepared and less anxious about undergoing this important diagnostic tool. As always, open communication with your healthcare provider is key to ensuring the best possible experience and outcomes from any medical procedure, including bone marrow tests.

Bone marrow test | Tests and scans

What is a bone marrow test?

A bone marrow test is a way of testing cells from your bone marrow. Bone marrow is the spongy tissue inside your bones that makes blood cells.

Why do I need it?

To find out whether there are any cancer cells in the bone marrow. You might also have one to check whether treatment is working.

How do you have it and how long does it take?

You have a local anaesthetic injection to numb a small area on your hip. The doctor puts a needle into your hip to suck out some bone marrow. The test takes about 30 minutes. You should get your results within 1 or 2 weeks.

Are there any side effects?

Possible side effects can include bruising, bleeding, pain, infection or tingling in the legs.

You have a bone marrow test to check whether there are cancer cells in your bone marrow. Bone marrow is spongy tissue and fluid that is inside your bones. It makes your blood cells. Depending on your cancer type, this test can also check how well your treatment is working. 

A doctor or specialist nurse removes a sample of bone marrow cells or an area of bone marrow in one piece. This is usually from your hip. A specialist doctor can then look at the cells or tissue under a microscope.

You usually have the test in the outpatient department of the hospital. But you may have this on the ward if you are staying overnight in hospital (inpatient).

You’re usually awake for the test. You have a local anaesthetic to numb the area. Some people have medicine to make them drowsy (sedation).

Why might you have a bone marrow test?

Bone marrow tests are usually done for cancers that are most likely to affect the bone marrow, such as:

  • lymphomas
  • leukaemia’s
  • myeloma

But it can be done for any type of cancer. This is usually if your doctor thinks your bone marrow could contain cancer cells, or they need to rule this out for any reason.

Types of biopsy

There are 2 main types of bone marrow test: 

  • bone marrow aspiration
  • bone marrow trephine biopsy

Aspiration means the doctor or nurse draws some liquid bone marrow up into a syringe.

A bone marrow trephine biopsy means they remove a very thin 1 or 2cm long core of bone marrow in one piece.

You usually have both of these tests done at the same time. They give some of the same information to the doctor, but there are differences. The bone marrow trephine shows the structure of the bone marrow inside the bone, whereas the aspiration takes just the bone marrow cells.

What happens

Your doctor will give you information about the procedure and asks you to sign a consent form. This is a good time to ask any questions you have.

You might need to change into a hospital gown. You can usually keep your underwear on.

You lie on your side with your knees tucked up into your chest.

Your doctor or nurse cleans the area with some antiseptic fluid. This can feel cold.

You’ll then have an injection into the skin over the biopsy site (local anaesthetic) to numb the area. They then put a thin needle through the skin into the hip bone. This might be uncomfortable for some, but this only lasts a short time.

Your doctor or nurse draws a small amount of liquid bone marrow into the needle, using a syringe. You might feel a pulling sensation when they start drawing the bone marrow cells out. 

They take this needle out and put the second one in if you are having a trephine biopsy. The aim is to get a small amount of marrow out in one piece.

The whole test takes around 30 minutes.

Take a look at this 2 minute video about having a bone marrow test. 

Transcript

What to expect when you have a bone marrow test

Your bone marrow is the spongy substance in the centre of the bones where the blood cells are made.

You may have a bone marrow test if you have a cancer which affects the bone marrow such as leukaemia, lymphoma or myeloma. if your doctor thinks your bone marrow may contain cancer cells that have spread from another type of cancer or you have a non-cancerous condition.

There are two types of tests. A bone marrow aspiration which takes some bone marrow cells and a bone marrow biopsy which takes samples of the bone marrow and gives more information about its structure.

Usually your doctor takes the sample from the back of your hip bone but you can have a bone marrow aspiration from your breast bone.

You have the test lying on a couch. You may have a sedative beforehand to make you sleepy. The doctor then injects some local anaesthetic to numb the area.

For a bone marrow aspiration they put a needle through your skin and into your bone. Then using a syringe they draw out some liquid bone marrow. You may feel a pulling sensation as they do this.

For a biopsy your doctor uses a slightly bigger needle to take the sample of bone marrow. They turn and push this needle to get the sample. This can be painful as the needle goes in but it doesn’t last for long.

You usually go home about half an hour after the test. If you had sedation you need to wait until you are fully awake. This can take a few hours.

Afterwards your hip will ache for a few days. Taking painkillers helps.

You may also have some bruising. Rarely you may have some slight bleeding from the site. Press on it if you do and if it doesn’t stop contact the hospital.

There is a small risk of infection. Tell your doctor if you have a temperature or the biopsy area becomes red and sore.

You may have some tingling in your leg which will also wear off with time.

Sedation

Some people prefer to have some type of sedative before the test so that they are a bit drowsy. Some hospitals may use gas and air (Entonox) to help relax you instead of sedation.

Children and teenagers often have sedation for this type of test.

We have a children’s cancer section where you can find out about this test if your child has acute lymphoblastic leukaemia (ALL).  

After your bone marrow test

You usually go home the same day if you’re feeling well enough.

You have a dressing over the site, which you should keep on for 24 hours. If you notice any bleeding apply pressure to the area. If it doesn’t stop, contact the hospital.

After the test, your hip might ache for a couple of days. You may need some mild painkillers such as paracetamol to take at home.

As you’re having sedation you’ll need someone with you so they can take you home and stay with you overnight. Also for 24 hours after you shouldn’t drive, drink alcohol, operate heavy machinery or sign any legally binding documents.

Possible risks from having a bone marrow test

A bone marrow test is very safe and any risks are small. 

During the procedure there is a very small risk of damage to nearby structures, but this is very rare.  

Bleeding

It’s not unusual to have a small amount of bleeding from the area where the needle went in. If you notice any heavy bleeding, apply pressure to the area. If it doesn’t stop, contact the hospital.

Bruising

Sometimes blood leaks out of the vein and collects under your skin. This can look like a small dark swelling under the skin (haematoma). Pressing hard once the needle is removed can help.

Infection

There is a small risk of getting an infection in the wound. Tell your doctor if you have a temperature or if the area becomes red and sore. 

Pain

Some people feel uncomfortable and have pain after the local anaesthetic has worn off. Your nurse will tell you what painkillers to take. If you have severe pain or it’s getting worse then you should contact the hospital.

Tingling in your leg

You may have some tingling in your leg which wears off with time.

Getting your results

Your bone marrow test is looked at in the laboratory. The time it takes to receive results depends on the which tests are being done on the bone marrow samples.

Basic results can be available as soon as 24 to 48 hours. Whereas if for example you’re having genetic tests on your bone marrow samples, these results can take a couple of weeks. You won’t get any results at the time of having a bone marrow taken. It’s best to ask your doctor or nurse how long it will take to get them.

Waiting for test results can make you anxious. You might have the contact details of a specialist nurse. You can contact them for information and support if you need to. It may also help to talk to a close friend or relative about how you feel. 

For support and information, you can call the Cancer Research UK nurses on freephone 0808 800 4040. The lines are open from 9am to 5pm, Monday to Friday.

More information

We have more information on tests, treatment and support if you have been diagnosed with cancer.

  • Hoffbrand’s Essential Haematology (8th Edition)
    AV Hoffbrand and D P Steensma
    Wiley Blackwell, 2019

  • The Royal Marsden Manuel of Clinical Nursing Procedures, Professional Edition (10th Edition)
    S Lister, J Hofland and H Grafton
    Wiley Blackwell, June 2020

  • Tissue pathways for lymph node, spleen and bone marrow trephine biopsy specimens
    The Royal College of Pathologists, November 2017

  • ICSH guidelines for the standardization of bone marrow immunohistochemistry
    E E Torlakovic and others
    International Journal Of Laboratory Hematology, 2015. Volume 37, Pages 431 to 449

  • European recommendations and quality assurance for cytogenomic analysis of haematological neoplasms
    KA Rock and others
    Leukaemia, 2019. Volume 33, Issue 19, Pages 1851 to 1867

  • The information on this page is based on literature searches and specialist checking. We used many references and there are too many to list here. Please contact [email protected] with details of the particular issue you are interested in if you need additional references for this information. 

Last reviewed: 

26 Jul 2022

Next review due: 

26 Jul 2025