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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This page helps you read the test results that come with a multiple myeloma diagnosis: the bone marrow biopsy, blood and urine tests, chromosome tests, and scans.
What the bone marrow biopsy shows
A bone marrow test is part of the workup for multiple myeloma. A doctor uses a hollow needle, in the hipbone or breastbone, to remove a sample of marrow. It is checked under a microscope for abnormal cells. Flow cytometry is a lab test that measures the number of cells in a sample and their features. It is used to help diagnose and manage some cancers.
What the blood and urine tests measure
Blood and urine samples are checked for certain antibodies (immunoglobulins), including M protein, beta-2-microglobulin, and free light chains. A 24-hour urine collection is another test. Blood tests also check calcium and albumin. NCI says beta-2-microglobulin and albumin levels are used for 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. NCI says certain chromosome changes are considered in stage III classification and affect outlook. 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 may be part of the workup. Doctors may use a skeletal survey (x-rays of all the bones), MRI, or PET-CT. These tests look for areas where bone is damaged.
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. M protein is usually stable. Smoldering myeloma causes no signs or symptoms and may be found while testing for something else. NCI describes watchful waiting for smoldering myeloma, and clinical trials may be an option. 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
Some tests, such as chromosome and FISH tests, are specialized. Ask when each pending result is expected, and whether any are needed before a treatment plan is set.
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
Common questions
What does the bone marrow biopsy show?
A doctor uses a hollow needle, in the hipbone or breastbone, to remove a sample of marrow for study under a microscope. Flow cytometry is a lab test that measures the number of cells in a sample and their features. It is used to help diagnose and manage some cancers.
What are the blood and urine tests measuring?
Blood and urine samples are checked for certain antibodies (immunoglobulins), including M protein, beta-2-microglobulin, and free light chains. A 24-hour urine collection is another test, and blood tests check calcium and albumin. NCI says beta-2-microglobulin and albumin levels are used for staging.
Why does chromosome testing matter?
NCI lists certain chromosome changes among the factors that affect outlook and staging. 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 M protein is usually stable. Smoldering myeloma causes no symptoms; NCI describes watchful waiting, and clinical trials may be an option. Active myeloma causes symptoms or organ damage and needs treatment.
Should I wait for every result before deciding?
Ask your team which results are still pending and whether any are needed before a treatment plan is set.
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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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, and this 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 then compared with the sources listed on it, looking for statements those sources do not back up. That check is not a sentence-by-sentence record and can miss errors. 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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