Lymphocyte and Monocyte Count from Whole Blood (with White Blood Cell Differential)
This test measures the proportions of different white blood cell types in your blood, specifically focusing on lymphocytes and monocytes. It helps assess immune function and inflammation.
["This test helps identify immune system balance and potential infections or inflammatory conditions."]
Key facts at a glance
- LOINC
- 30119-2
- Short code
- Lymphs IgM # WBC
- Synonyms
- Lymphs IgM # WBC
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 4.5
- Ref high
- 11
- Critical range
- 2 N/A – 30 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 85004
- SNOMED
- 900000000000003002
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
Why This Test Matters for Your Health
Your immune system relies on various white blood cells (WBCs) to fight infections and maintain health. This test provides a detailed breakdown of your WBC types, including lymphocytes (a key part of your immune response) and monocytes (which help fight chronic infections and inflammation).
What to Expect Before the Test
No special preparation is needed for this test. You’ll have a small needle inserted into your arm to draw a small amount of blood. The process usually takes a few minutes. If you’re on blood thinners or have a history of bleeding issues, let your provider know before the test.
How the Results Are Used
Healthcare providers use these results to diagnose or monitor conditions like immune deficiencies, infections, autoimmune diseases, or certain cancers. For example, low lymphocyte counts might suggest weakened immunity, while abnormal monocyte levels could indicate chronic inflammation.
Common Conditions This Test Helps Detect
This test can help identify issues such as leukemia, lymphoma, HIV/AIDS (due to low lymphocyte counts), chronic infections, or inflammatory diseases like rheumatoid arthritis. It may also be used to monitor treatment responses in certain conditions.
Reference range
Adult: 4.5-11.0 x 10^9/LN/A
No special preparation required. Stay well hydrated.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance: How Results May Affect Your Care
Short name
WBC Differential (Lympho/Monocyte Focus)
Frequently asked questions
How might abnormal results change my treatment plan?
What if my results are outside the normal range?
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