Basoeosmonosbld
A blood test that measures the absolute counts of three types of white blood cells: basophils, eosinophils, and monocytes.
{"This test measures three types of white blood cells that help fight infections and regulate immune responses","Abnormal levels may indicate allergies, infections, inflammatory conditions, or blood disorders","The test requires a simple blood draw and results are reported as absolute cell counts"}
Key facts at a glance
- LOINC
- 32349-3
- Short code
- BASOEOSMONO
- Synonyms
- Baso+Eos+Monos # Bld
- Category
- chemistry
- Sample
- whole-blood
- Container
- EDTA (lavender-top) tube
- Units
- N/A
- Ref low
- 0
- Ref high
- 200
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- Automated flow cytometry with impedance (CBC differential)
- CPT
- 85025
- SNOMED
- 365642009
- Specimen volume
- 3 mL whole blood (minimum 1 mL for pediatric)
- Stability
- Stable for 4 hours at room temperature (20-25°C); up to 24 hours refrigerated (2-8°C); do not freeze.
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 1–4 hours
- Order
- routine
What is this test?
This test measures the absolute number (count) of three types of white blood cells in your blood: basophils, eosinophils, and monocytes. White blood cells are essential for your immune system to fight infections and protect your body. This test provides specific counts rather than just percentages of these cell types.
What are basophils, eosinophils, and monocytes?
Basophils are the least common white blood cells. They release histamine during allergic reactions and help fight certain infections. Eosinophils primarily fight parasitic infections and play a key role in allergic reactions and inflammatory responses. Monocytes are the largest white blood cells; they engulf (phagocytize) bacteria, viruses, and other foreign substances, and help coordinate immune responses.
How is this test performed?
A healthcare professional will draw a small sample of blood from a vein in your arm. The sample is then analyzed in a laboratory using automated blood counting equipment to determine the exact number of each cell type per microliter (μL) of blood. No special preparation is typically required, though your doctor may ask you to fast or avoid certain medications before the test.
What do the results mean?
Results are given as absolute counts for each cell type. Reference ranges vary by laboratory but are generally: Basophils 0-100 cells/μL, Eosinophils 0-500 cells/μL, and Monocytes 0-800 cells/μL. Your doctor will interpret your results based on your overall health, symptoms, and other test findings.
Reference range
Basophils: 0-200 cells/µL; Eosinophils: 0-500 cells/µL; Monocytes: 200-950 cells/µL (varies by analyzer and population)N/A
No fasting required. Avoid strenuous exercise immediately prior to collection as it may transiently alter leukocyte counts.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings3
Frequently asked questions
Is fasting required before this test?
Are there any risks from this blood test?
Can normal levels still mean I have a problem?
How often should this test be done?
Sources
- 1
- 2
- 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