Bone Marrow Biopsy and Aspiration

A bone marrow examination takes a small sample of the spongy tissue inside the back of your pelvic bone, where blood cells are made. Two samples are usually taken through the same spot: liquid marrow drawn into a syringe (aspirate) and a thin solid core about 1 to 2 cm long (trephine biopsy).

It shows directly how blood cells are being produced and whether abnormal cells are present. It samples one site only, so patchy disease can occasionally be missed, and it complements rather than replaces blood tests and scans.

What Bone Marrow Biopsy and Aspiration shows

Under the microscope the haematologist assesses how full the marrow is, whether red cells, white cells and platelets are maturing normally, and whether there are leukaemia, lymphoma, myeloma or secondary cancer cells, scarring (fibrosis), iron depletion or infection. The aspirate is also sent for flow cytometry, which identifies cell types by their surface markers, for chromosome analysis, and for molecular tests that look for specific gene changes. These define the exact subtype of a blood cancer, its risk group, and later whether treatment has cleared it to the level of minimal residual disease.

When Bone Marrow Biopsy and Aspiration is recommended

• Unexplained low or high blood counts that blood tests have not clarified
• Suspected or confirmed leukaemia, myelodysplastic syndrome, myeloma or myeloproliferative disease
• Staging of some lymphomas and childhood cancers
• Assessing response after chemotherapy or before and after a stem cell transplant
• Fever of unknown origin or suspected storage and infiltrative diseases
• Suspected aplastic anaemia

Limits and situations where another test is better:

• Anaemia clearly explained by iron, B12 or folate deficiency on blood tests
• Many lymphomas, where a PET-CT scan has replaced routine marrow staging
• Skin infection over the biopsy site; another site is chosen
• Severe uncorrected clotting factor disorders. A low platelet count alone is not a bar

How to prepare

• List your medicines, especially anticoagulants and antiplatelets; the team will say if any dose should be held
• No fasting is needed for local anaesthesia; fast for 6 hours if sedation is planned
• Arrange someone to accompany you if you will be sedated
• Mention allergies to local anaesthetic, latex or skin antiseptics

What happens during the test

You lie on your side or front. The skin and the surface of the bone at the back of the hip are numbed with local anaesthetic, which stings briefly. A hollow needle is pushed through the bone surface; you feel firm pressure. Drawing the liquid marrow causes a sharp, pulling ache down the leg that lasts a few seconds. The core needle is then rotated in and out. The whole visit takes about 30 minutes, of which the sampling is 10. Children, and adults who request it, are given sedation.

Results and next steps

A first look at the aspirate smear can be available within hours to a day, which matters if acute leukaemia is suspected. The trephine needs processing and takes 3 to 7 working days; chromosome and molecular results take 1 to 3 weeks. Your haematologist combines them into a final diagnosis and treatment plan, so expect a preliminary and then a complete report.

• Test time: About 30 minutes
• Results ready: Preliminary in 1 to 2 days, complete in 1 to 3 weeks
• Back to everyday activity: Rest of the day; keep the dressing dry for 24 hours

Safety and risks

• Aching or bruising at the site for a few days, common
• Bleeding or haematoma, more likely with very low platelets or blood thinners
• Infection at the puncture site, rare
• Lasting pain or nerve irritation, very rare
• An inadequate or dry sample requiring a repeat

Arranging Bone Marrow Biopsy and Aspiration in Türkiye

This test is normally done where your blood disorder is being treated. It can be part of a second-opinion visit, for example to confirm a subtype with a wider molecular panel before choosing treatment or a transplant. Ask first whether your existing slides and blocks can simply be re-read, which often avoids a repeat procedure.

Send your previous reports and the question you want answered and a Clinic-Y coordinator replies within 24 hours with suitable teams and written, all-inclusive proposals side by side. Reviewing your case is free.

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