Lymphocyte and Monocyte Blood Count (with Differential Analysis)
This test measures the number of lymphocytes and monocytes in your blood, which helps assess immune function and identify potential infections, inflammation, or blood disorders.
["This blood test helps doctors understand how your immune system is working and spot possible health issues early."]
Key facts at a glance
- LOINC
- 35081-9
- Short code
- Lymphs+Monos # Bld
- Synonyms
- Lymphs+Monos # Bld
- Category
- chemistry
- Sample
- whole-blood
- Container
- Lavender-top (EDTA)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- 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
What Are Lymphocytes and Monocytes?
Lymphocytes are a type of white blood cell that plays a key role in fighting infections and diseases. Monocytes are another type of white blood cell that helps remove debris and pathogens from your body. Both are part of your immune system and can be measured to check for health concerns.
Why Might This Test Be Ordered?
Your doctor may order this test to evaluate your immune response, diagnose conditions like infections, autoimmune diseases, or blood disorders, or monitor treatments for conditions affecting white blood cells.
How Is the Test Performed?
A small blood sample is taken from a vein in your arm. The sample is then analyzed in a lab to count and identify the different types of white blood cells, including lymphocytes and monocytes.
What Do the Results Mean?
Results show the absolute counts of lymphocytes and monocytes. Abnormal levels may indicate infections, immune system disorders, 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 or monocyte counts can signal underlying health problems. For example, low lymphocyte counts might suggest immune deficiencies or chronic illnesses, while high levels could indicate acute infections or certain inflammatory conditions. This test helps guide treatment decisions and monitor disease progression.
Short name
Lympho/Monocyte Blood Test
Frequently asked questions
What does a low or high count of lymphocytes or monocytes mean?
How long does it take to get the results of this test?
Can lifestyle changes affect these test 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