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A bone marrow aspiration involves taking a sample of bone marrow, usually from the back of the large pelvic bone. This involves the insertion of a special needle into the marrow of the bone after local anaesthetic has been used to numb the tissues surrounding it.
Venous sampling is a procedure that involves inserting a catheter (thin tube) into a specific vein or veins, taking blood samples from them and sending them to the laboratory for testing.
This leaflet is predominantly aimed at patients who have received chemotherapy in a hospital setting over a period of several months either locally or in London where they have undergone a stem cell transplant.