Absolute Lymphocyte Count (Automated Blood Cell Differential)
This test measures the number of lymphocytes, a type of white blood cell, in your blood. It helps assess immune function and detect conditions like infections, autoimmune diseases, or certain cancers.
["Lymphocytes help fight infections and support immune health; this test helps doctors evaluate your immune system’s strength."]
Key facts at a glance
- LOINC
- 71678-7
- Short code
- Lymphocytes NFr.DF Bld Auto
- Synonyms
- Lymphocytes NFr.DF Bld Auto
- Category
- chemistry
- Sample
- whole-blood
- Container
- Lavender-top (EDTA)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- automated-count
- 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 infections (such as viral or bacterial), monitor immune-related conditions (like lupus or HIV), or evaluate symptoms like frequent illnesses, fatigue, or unexplained weight loss. It can also be part of routine blood work or before certain treatments.
What to Expect Before the Test
No special preparation is needed. You’ll have a small needle inserted into your arm, and blood will be drawn into a tube. The process usually takes a few minutes. If you’re nervous, let your healthcare provider know—they can help.
What the Results Mean
Results show your absolute lymphocyte count, which is the total number of lymphocytes per microliter of blood. While reference ranges vary by lab, low counts may suggest immune suppression, while high counts could indicate chronic infections or other conditions. Your doctor will interpret results in the context of your health.
Common Conditions Affecting Results
Low lymphocyte counts might be linked to conditions like HIV/AIDS, chemotherapy, or severe infections. High counts could signal chronic infections (e.g., tuberculosis), autoimmune diseases (e.g., rheumatoid arthritis), or certain cancers. Always discuss symptoms with your doctor.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
Lymphocyte Count (Auto)
Frequently asked questions
How often will I need this test?
Can I eat or drink before the test?
What if my lymphocyte count is outside the normal range?
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