Good to knowOne result rarely tells the whole story. Your provider looks at your results together with your symptoms, exam, and other tests.
What the test is
It's done with numbing medicine and sometimes sedation.
Why it's done
- Unexplained low or high blood counts
- Diagnosing or staging leukemia, lymphoma, or myeloma
Getting ready and what happens
- Tell your provider about blood thinners. Arrange a ride if you'll be sedated.
How the test is done
- You lie on your side or stomach; after numbing, a needle removes liquid marrow and a small core of bone.
What the results mean
Results
Show how the marrow is making blood cells and whether abnormal cells are present.
Questions to ask your provider
- What do my results mean for me?
- Do I need to repeat this test or have other tests?
Risks
Soreness for a few days, bruising, and rarely bleeding or infection.
Related conditions
Related tests
Sources
Last updated 2026-11-13.