Lymphocyte Subpopulation Analysis by Flow Cytometry (Quantitative, Total Lymphocyte Count and Specific Subset Counts)
This test measures the types and amounts of white blood cells called lymphocytes in your blood, which help fight infections. It may be used to assess immune function or identify conditions affecting your immune system.
["Understanding your lymphocyte counts can help diagnose or monitor immune-related health concerns."]
Key facts at a glance
- LOINC
- 74750-1
- Short code
- Cleft Lymphs Bld/T Ql Micro
- Synonyms
- Cleft Lymphs Bld/T Ql Micro
- Category
- chemistry
- Sample
- whole-blood
- Container
- Lavender-top (EDTA)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- microscopy-light
- Specimen volume
- 3 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 4–24 hours
- Order
- routine
Why This Test Is Done
Doctors may order this test to check for immune system disorders, such as infections, autoimmune diseases, or conditions like leukemia or lymphoma. It can also be used before or after treatments that affect the immune system, like chemotherapy or organ transplants.
What to Expect Before the Test
No special preparation is usually needed. You may be asked to fast for 8–12 hours before the blood draw if your test includes fasting components, but this is not always the case for lymphocyte subset analysis alone. Bring your medical records or questions to your appointment.
How the Test Is Performed
A healthcare professional will draw blood from a vein in your arm using a small needle. The blood sample is then analyzed in a lab to count and identify different types of lymphocytes, such as T-cells, B-cells, and natural killer cells.
What the Results Mean
Results show the total number of lymphocytes and the proportions of each subset. Abnormal counts may indicate immune deficiencies, overactive immune responses, or other health issues. Your doctor will interpret the results in the context of your overall health and symptoms.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Changes in lymphocyte counts can signal underlying conditions, such as weakened immunity (e.g., HIV/AIDS), overactive immune responses (e.g., rheumatoid arthritis), or cancers affecting the blood or bone marrow. Regular monitoring may be needed if you have chronic illnesses or undergo treatments that impact immune function.
Short name
Lymphocyte Profile
Frequently asked questions
How long does it take to get my results?
What does it feel like to have blood drawn?
Can I eat or drink before this test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy