Hematologist
CION Cancer Clinics
Is a bone marrow test dangerous or paralysing? | CION Cancer Clinics
No, it cannot paralyse you. The sample is taken from the back of the hip bone, well away from the spine and the nerves to your legs. Serious problems are rare. The usual after-effects are soreness and a bruise for a few days, and most people walk out the same day. This page explains where the needle goes, what you will feel, the real risks, and why the test matters. At CION Cancer Clinics, our haematology team supports patients and families through treatment, cost questions and life at home.
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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
- Can a bone marrow test cause paralysis?
- How is it different from a lumbar puncture?
- What actually happens during the test?
- What do families believe about marrow tests, and what is true?
- What are the real side effects?
- Why does the doctor need this test, and what if you refuse?
- Common questions about bone marrow tests
The short answer
Can a bone marrow test cause paralysis?
No. A bone marrow test is taken from the back of the hip bone, not from the spine, and the needle does not go anywhere near the spinal cord. It cannot damage the nerves that control your legs. Serious problems are rare, and most people go home the same day.
Where the needle actually goes
Bone marrow is the soft tissue inside your bones where blood cells are made. The easiest place to reach it in an adult is the rounded top of the hip bone at the back, just above the buttock. You can feel that bone with your own hand. It sits to the side, away from the backbone, and there are no large nerves in its path.
Why the fear is so strong
Because you lie on your side or front and the doctor works behind you, it feels as though the needle is going into your back. Relatives waiting outside hear the word "back" and imagine the spine. Many people also confuse this test with a lumbar puncture, which is a different test with a different purpose. Both myths grow in the telling, and families sometimes refuse a test that the diagnosis depends on.
In small children the test may be taken from the shin bone instead. That is also nowhere near the spine.Two different tests
How is it different from a lumbar puncture?
Bone marrow test
Lumbar puncture (spinal tap)
Needle into the back of the hip bone
Needle between two bones of the lower back
Takes a sample of marrow, the blood-making tissue
Takes a sample of the fluid around the brain and spinal cord
Used to find the cause of abnormal blood counts
Used to check whether some leukaemias have reached the brain fluid
Well away from the spinal cord
Placed below the level where the spinal cord ends
Not sure whether this applies to you?
Ask an oncologistOn the day
What actually happens during the test?
Getting ready
You are asked about blood thinners and allergies, and a blood count may be checked. Do not stop any medicine on your own. Ask the team what applies to you.
Numbing the area
You lie on your side. The skin and the surface of the bone are numbed with a local anaesthetic injection. Some centres also offer a medicine to help you relax.
Taking the samples
A liquid sample is drawn first. Many people feel a deep, brief pulling ache at this moment. A small core of bone may then be taken, which feels like pressure.
Afterwards
A dressing is pressed on and you lie on your back for a short while. The whole visit usually takes a few hours, most of it waiting.
Commonly believed
What do families believe about marrow tests, and what is true?
"They take fluid from the spine, so he may never walk again."
The sample comes from the hip bone, not the spine. Walking, sitting and working are not affected by the test. Most people walk out of the room on their own.
"Taking marrow out will leave the body weak for life."
Only a tiny amount is taken, and your marrow keeps making blood as before. The bone heals by itself. There is no lasting weakness from the sample.
"If they want a marrow test, it must already be cancer."
Doctors ask for it when blood tests cannot explain the result. It rules conditions out as often as it confirms them, and many results show no cancer at all.
"The needle will spread the cancer into the bone."
A blood cancer is already in the marrow and the blood. The needle does not move it anywhere new.
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Being honest about risk
What are the real side effects?
These are the things that do happen. Most are mild and settle by themselves.
Soreness
An ache at the hip for a few days is common. Your team will tell you which pain relief is suitable. Some painkillers affect bleeding, so ask before taking any.
Bruising
A bruise under the dressing is expected and fades on its own over the following days.
Bleeding
A little oozing is common. More bleeding is uncommon and more likely when platelets are very low or blood thinners are taken, which is why the team checks these first.
Tell the team about
- Any blood thinner or aspirin
- Past bleeding problems
Infection
Rare, because the skin is cleaned and sterile equipment is used. Keep the dressing dry for as long as the team advises.
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After the test: when to get help the same day
Contact the team or go to the nearest emergency department if bleeding soaks through the dressing and does not stop with firm pressure, if the site becomes hot, swollen and increasingly painful, or if you develop a fever. If your counts are low, a fever is urgent in its own right. Call 108 if you cannot get to hospital safely.
Being straight with you
Why does the doctor need this test, and what if you refuse?
Some blood conditions cannot be diagnosed from a blood sample alone. The marrow shows how blood cells are being made, which type of disease is present, and which genetic changes are in the cells. Those details decide which treatment is offered.
What delay can cost
Refusing or postponing the test does not make the condition wait. In fast-moving leukaemias, days matter. If you are frightened, say so. Ask what the test will answer, whether another test could give the same answer, and what relief from discomfort is available.
Questions worth asking before you agree
Ask which question the test is meant to answer, and which part of the hip bone will be used. Ask whether you will be awake, whether someone should come with you, and whether any of your medicines need a plan from the team beforehand. Ask when the first results and the full report are expected. Writing these down helps, because anxious people forget questions once they are in the room. A family member can ask them for you.
How CION helps
CION's haematology team, including Dr. Basudev Pokhrel, explains why the test is needed, arranges it with a qualified centre where required, and reads the result with you. Complex cases are discussed at a tumour board.
What this page cannot tell you
It cannot tell you whether you need the test, or what your result will show. Your haematologist can answer both.
Questions we are asked
Common questions about bone marrow tests
Does a bone marrow test hurt?
The numbing injection stings briefly. During the test most people feel pressure and a short, deep pulling ache when the liquid sample is drawn. It is uncomfortable rather than severe for most people. Tell the team if you are anxious, because a relaxing medicine may be possible.
Will I be put to sleep for the test?
Adults usually stay awake with local numbing, sometimes with a medicine to help them relax. Children are often given sedation or a short general anaesthetic. If you are given a sedative, you will need someone to take you home and should not drive that day.
Can I walk after a bone marrow test?
Yes. You rest for a short while and then walk out normally. Your legs are not affected, because no nerves to the legs are in the needle's path. You may feel sore at the hip when sitting or bending for a few days.
When can I go back to work?
Most people can return to desk work the next day, and some the same day. Avoid heavy lifting, swimming and hard exercise until the site has settled, and follow the timing your team gives you. If you had a sedative, rest for the remainder of the day.
How long do the results take?
A first look under the microscope may be ready quickly, but the full report often takes longer, because special tests for cell markers and genetic changes run separately. Ask your team which parts will come back first, and when you will meet to discuss them.
Is the test safe for elderly parents?
Age on its own is not a reason to avoid it. The team checks blood thinners, platelet count and general health first. Older bones can be harder to sample, but the procedure is the same. Bring a full list of medicines, including any for the heart.
Will I need the test more than once?
Sometimes. In leukaemia and some other conditions, repeat tests show how well treatment is working. Your haematologist will explain when a repeat is planned and what it is looking for. Each test carries the same low level of risk.
Can the sample be taken from a blood test instead?
Some questions can be answered from blood, and your doctor will use that route where it works. When the marrow itself must be examined, a blood sample cannot replace it. Asking whether a blood test would be enough is a reasonable question to put to your doctor.
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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 Heart, Lung, and Blood Institute — Bone marrow tests
- Cancer Research UK — Tests and scans
- Leukemia & Lymphoma Society — Leukemia & Lymphoma Society
- National Health Mission — National Health Mission
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.
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Been told you need a bone marrow test?
Call the helpline or share your reports. CION's haematology team will explain why the test is needed and what happens next. One helpline serves every CION centre.