Lymphocyte count (absolute)
This test measures the number of lymphocytes, a type of white blood cell that helps your immune system fight infections and diseases.
["Lymphocytes help protect your body by identifying and attacking harmful invaders like bacteria and viruses."]
Key facts at a glance
- LOINC
- 107061-4
- Short code
- TCD3
- Synonyms
- Cells.CD3+CD19- (T cells)/lymph NFr Spec FC
- Category
- chemistry
- Sample
- serum
- Container
- Heparinized (sodium or lithium heparin) or EDTA anticoagulated whole blood tube; ACD tube also acceptable. Dedicated tubes for flow cytometry may be preferred.
- Units
- N/A
- Ref low
- 61
- Ref high
- 85
- Critical range
- 5 N/A – 95 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 0–120 years
- Method
- flow-cytometry
- CPT
- 86359
- SNOMED
- 272631009
- Specimen volume
- 1-3 mL of whole blood minimum; 5 mL preferred for pediatric or repeat testing
- Stability
- Specimen should be processed within 24-48 hours of collection when stored at room temperature (18-25°C). Do not refrigerate. Stability depends on anticoagulant used.
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–48 hours
- Order
- routine
What is a lymphocyte count used for?
Doctors may order a lymphocyte count to check for immune system issues, such as infections, autoimmune disorders, or certain cancers. It can also help monitor treatment responses in conditions like leukemia or HIV.
How is this test performed?
A small blood sample is taken from a vein in your arm. The blood is then analyzed in a lab to count the number of lymphocytes present.
What might affect my results?
Several factors can influence lymphocyte counts, including recent infections, certain medications (like steroids), chronic illnesses, or stress. Your doctor will consider these when interpreting your results.
What does a low or high lymphocyte count mean?
A low lymphocyte count may suggest immune suppression, while a high count could indicate overactive immune responses, infections, or certain diseases. Your doctor will discuss these findings with you based on your full medical picture.
Reference range
Adult reference range: T cells (CD3+CD19-) typically 61-85% of total lymphocytes; absolute count approximately 800-2900 cells/µL. Reference ranges vary by laboratory and age; pediatric values differ.N/A
No special preparation required. Specimen should be processed within the stability window specified. Avoid extreme exercise prior to collection as it may transiently affect lymphocyte subset distribution.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical significance: Lymphocyte counts are critical for diagnosing and managing conditions affecting immunity. Abnormal levels may signal immune deficiencies, infections, or inflammatory diseases that require further medical evaluation.
Short name
Lymphocyte blood count
Frequently asked questions
Why do I need this test?
Will I feel any discomfort during the blood draw?
How long will I need to wait for results?
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