CD3+ Lymphocyte Count (Absolute)
This test measures the number of CD3+ cells, a type of white blood cell important for immune function. CD3 cells are part of the T-cell subset, which helps the body fight infections and regulate immune responses.
["CD3+ lymphocytes help protect your body by identifying and attacking harmful invaders."]
Key facts at a glance
- LOINC
- 106913-7
- Short code
- CD3-BAL-FC
- Synonyms
- CD3 Cells/lymph NFr BAL FC
- Category
- chemistry
- Sample
- serum
- Container
- Sterile collection container for BAL fluid; transport in saline or cell culture medium; keep at room temperature or 4°C for flow cytometry analysis
- Units
- N/A
- Ref low
- 60
- Ref high
- 80
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 1–99 years
- Method
- flow-cytometry
- CPT
- 86356
- SNOMED
- 399007007
- Specimen volume
- Minimum 5-10 mL of BAL fluid required for flow cytometry analysis; total BAL return volume typically 30-100 mL per lavaged segment
- Stability
- Process BAL fluid for flow cytometry within 2-4 hours of collection to maintain cell viability; if delayed, specimens may be stored at 4°C for up to 6 hours in appropriate transport medium
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
Why This Test Is Done
Doctors may order this test to evaluate immune function, especially in cases of suspected immune deficiencies, lymphoma, or other blood-related disorders. It can also help monitor treatment responses in conditions like leukemia or autoimmune diseases.
What to Expect Before the Test
No special preparation is usually needed. You may have a small needle inserted into a vein (typically in your arm) to draw blood. This is a quick procedure, often done in a clinic or lab setting.
How the Test Works
Blood is collected and analyzed to count the number of CD3+ cells. This involves examining a sample under a microscope or using advanced laboratory techniques to identify and quantify these immune cells.
Possible Results and Interpretation
Results are expressed as a count of CD3+ cells per microliter (cells/µL) of blood. Lower than expected counts may indicate immune system issues, while higher counts could be seen in certain infections or inflammatory conditions.
Reference range
CD3+ T-lymphocytes in BAL fluid typically range from approximately 60-80% of total lymphocytes in healthy adults; absolute CD3+ T-cell counts in BAL vary by clinical context and laboratory protocolN/A
Bronchoalveolar lavage is performed during bronchoscopy. Patient should follow standard pre-bronchoscopy fasting guidelines (typically NPO for 6-8 hours prior to procedure). Informed consent must be obtained. Review for contraindications including bleeding diathesis, severe hypoxemia, or recent myocardial infarction.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
CD3 Lymphocyte Count
Frequently asked questions
What does a low CD3+ lymphocyte count mean?
Can diet affect CD3+ lymphocyte counts?
How often should this test be repeated?
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