The short answer
Evaluation may include blood and urine protein studies, marrow examination, imaging, blood counts, calcium, kidney tests, and molecular risk assessment. Each result should answer a specific diagnostic, risk, or treatment question.
Evaluation may include blood and urine protein studies, marrow examination, imaging, blood counts, calcium, kidney tests, and molecular risk assessment.
Planning may depend on symptoms and organ effects, stage and risk, kidney function, bone disease, frailty, transplant eligibility, and goals.
A result can be diagnostic, prognostic, predictive, or useful for monitoring—and these are not identical roles.
Ask which results are confirmed and which remain pending.
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The full explanation.
What the bone marrow biopsy shows
A bone marrow biopsy is central to diagnosing multiple myeloma. A doctor uses a hollow needle, usually in the hip bone, to remove a small sample of marrow, blood, and bone. A pathologist counts what percentage of the marrow is made up of abnormal plasma cells. Flow cytometry is a test that passes cells past a laser to read surface markers. It confirms the cells are cancerous plasma cells, not normal ones.
What the blood and urine tests measure
Myeloma cells make an unneeded antibody protein called M protein. Blood and urine tests can measure it. Two related tests matter for reading your results. Beta-2-microglobulin is a protein that rises with higher disease burden. Free light chains are small antibody fragments. They can be abnormal even when M protein levels are low. A 24-hour urine collection checks for a related protein. Blood chemistry tests also check calcium and albumin, a blood protein whose level affects staging.
Cytogenetics and FISH: reading the risk
Chromosome testing looks for specific gene changes in the myeloma cells. It is done through cytogenetic analysis and a more sensitive test called FISH. Certain changes are linked to higher-risk disease and can shift which combination of drugs your team recommends first. Ask your team to explain, in plain terms, whether your result falls into a standard-risk or higher-risk category.
Imaging: looking for bone damage
Myeloma can damage bone, so imaging is part of every workup. Doctors may use a skeletal survey (x-rays of the whole skeleton), MRI of the spine and pelvis, or a combined PET-CT scan. These tests look for the thinned or eroded bone areas that myeloma can cause, which can matter for both diagnosis and treatment planning.
Not every abnormal plasma cell finding is myeloma
Finding abnormal plasma cells does not always mean active myeloma needing treatment right away. MGUS stands for monoclonal gammopathy of undetermined significance. It means fewer than 10% abnormal plasma cells in the marrow, with no cancer and no symptoms. Doctors watch it rather than treat it. Smoldering myeloma means higher plasma cell numbers or protein levels, but still no symptoms. Many people are watched closely, and some may be offered treatment or a clinical trial depending on how their risk is judged. Active myeloma causes symptoms or organ damage and needs treatment. Ask your team exactly where your results place you on this spectrum.
What's still pending
Chromosome and FISH panels are specialized tests, and they usually come back later than routine blood counts. Ask when each pending result is expected. If your case is not urgent, it is reasonable to wait for a complete picture, including risk category, before finalizing a treatment plan.
What to ask your team
- What percentage of my bone marrow is abnormal plasma cells?
- What are my M protein, free light chain, and beta-2-microglobulin results?
- Is my cytogenetic and FISH result standard-risk or higher-risk?
- Do my scans show any bone damage, and does that change urgency?
- Am I in the MGUS, smoldering, or active myeloma category?
Sources
Words to know
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Common questions
What does the bone marrow biopsy show?
A doctor uses a hollow needle, usually in the hip bone, to remove a small sample of marrow, blood and bone. A pathologist then counts what percentage of the marrow is made up of abnormal plasma cells. Flow cytometry, which passes cells past a laser to read surface markers, confirms that the cells are cancerous plasma cells rather than normal ones.
What are the blood and urine tests measuring?
Myeloma cells make an unneeded antibody protein called M protein, which blood and urine tests can measure. Beta-2-microglobulin rises with higher disease burden, and free light chains are small antibody fragments that can be abnormal even when M protein is low. A 24-hour urine collection checks for a related protein, and blood chemistry checks calcium and albumin, whose level affects staging.
Why does chromosome testing matter?
Because certain gene changes are linked to higher-risk disease, and they can shift which combination of drugs your team recommends first. The testing is done through cytogenetic analysis and a more sensitive test called FISH. Ask your team to explain in plain terms whether your result falls into a standard-risk or a higher-risk category.
Does finding abnormal plasma cells mean I need treatment now?
Not always. MGUS means fewer than 10% abnormal plasma cells in the marrow, with no cancer and no symptoms, and doctors watch it rather than treat it. Smoldering myeloma means higher plasma cell numbers or protein levels but still no symptoms; many people are watched closely and some may be offered treatment or a clinical trial depending on risk. Active myeloma causes symptoms or organ damage and needs treatment.
Should I wait for every result before deciding?
Often yes. Chromosome and FISH panels are specialized tests and usually come back later than routine blood counts, so ask when each pending result is expected. If your case is not urgent, it is reasonable to wait for the complete picture, including your risk category, before finalizing a treatment plan.
Questions to ask your doctor
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Sources last checked: 2026-08-13 what this meansLast updated: 2026-08-17Next planned review: 2027-07-22
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How this page was created
Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes. We do not employ clinicians and do not intend to — our work is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source checked — This page was written with AI assistance and checked line by line against the sources listed on it. That confirms the sources support what the page says. It is not a medical review, and it does not confirm the page is complete or right for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
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