Quick Answer
A plain-language guide to flow cytometry and why it is more than a single test result.
Medically reviewed by Dr. Sachita Baniya • NMC 20158 • Kathmandu Neurology Clinic & Cognitive Center
Flow cytometry is a laboratory technique that analyses individual cells as they pass through a laser. It is used throughout haematology to identify cell lineage, maturation and abnormal marker expression.
What it measures
Cells are labelled with antibodies that bind specific surface or intracellular proteins. The instrument records size, granularity and fluorescence. A panel of markers can distinguish B cells, T cells, myeloid cells, blasts and plasma cells.
Where it is used
- Leukemia diagnosis and subtyping
- Lymphoma assessment in blood, marrow and tissue
- Plasma cell disorder evaluation
- Unexplained cytopenias
- Measurable residual disease monitoring
What the report means
A flow report describes the populations present and whether they show an abnormal phenotype. It is not a standalone diagnosis. The haematologist integrates it with morphology, cytogenetics, molecular findings and the clinical picture.
Limitations
Flow cytometry requires viable cells and an adequate sample. Small populations may be below detection, and tissue architecture is not assessed. Prior treatment can alter marker expression. A negative result does not exclude disease.
Questions to ask
- What population was abnormal, and what does it suggest?
- Does the result need confirmation with another test?
- Will this test be repeated to monitor response?
- How does it change the treatment plan?
The bottom line
Flow cytometry is one of the most informative tools in haematology, but it works best when interpreted alongside the rest of the diagnostic picture. Ask for an explanation of what the result means for you, not just the number.
Frequently asked questions
Answers reviewed by Dr. Jitendra Prasad Yadav • MBBS, MD (Internal Medicine), FICN (Neurology), FCNV, FIHM • NMC 8029
AML can be cured in a proportion of patients, particularly younger adults who achieve remission and proceed to appropriate consolidation or transplant. Outcomes vary widely with genetic subtype, age and fitness, so the treating team discusses prognosis for the individual case rather than giving a single figure.
Induction is the first phase of treatment, aiming to clear leukemia cells from the marrow and restore normal blood production. It usually requires hospital admission and close support with transfusion, infection prevention and monitoring.
No. Many patients with early, asymptomatic disease are monitored. Treatment is started when specific criteria are met, such as progressive marrow failure, bulky disease or symptoms.
Watch and wait means regular blood counts and clinical review without active treatment. It avoids unnecessary side effects and does not reduce the chance of responding when treatment is eventually needed.
More: All FAQs → · Ask Dr. Jitendra →
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References & Review
Reviewed by Dr. Jitendra Prasad Yadav • Last reviewed: 2026-11-10
- International Classification of Headache Disorders, 3rd edition (ICHD-3).
- Harrison's Principles of Internal Medicine — Neurology sections.
- American Academy of Neurology guidelines for selected conditions (where applicable).
Content is educational and aligns with standard medical references; individual evaluation may vary. External links provide context and do not imply endorsement.