Basoeosmonosnfrbldauto
This test measures the levels of three types of white blood cells—basophils, eosinophils, and monocytes—in your blood to help evaluate your immune system and diagnose various conditions.
{"Measures three types of white blood cells that protect against infections and allergies","Helps diagnose allergic reactions, parasitic infections, and immune disorders","A simple blood draw is all that's needed—no special preparation required","Results are compared to normal ranges to check for high or low cell counts","Abnormal results may require additional testing to determine the cause"}
Key facts at a glance
- LOINC
- 32155-4
- Short code
- BASO+EOS+MONO/WBC
- Synonyms
- Baso+Eos+Monos NFr Bld Auto
- Category
- chemistry
- Sample
- whole-blood
- Container
- EDTA (lavender/purple top) vacutainer tube; K2-EDTA or K3-EDTA anticoagulant
- Units
- N/A
- Ref low
- 2
- Ref high
- 12
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–99 years
- Method
- automated-count
- CPT
- 85025
- SNOMED
- 273944007
- Specimen volume
- Minimum 1 mL whole blood; optimal fill volume 3-5 mL to maintain proper anticoagulant ratio
- Stability
- Stable for up to 24 hours at room temperature (18-25°C); up to 48 hours refrigerated (2-8°C); perform analysis within 4 hours for optimal differential accuracy
- Hemolysis max
- 100
- Lipemia max
- 300
- Icterus max
- 15
- TAT
- 1–4 hours
- Order
- routine
What is this test?
This test measures the number and percentage of three specific types of white blood cells (leukocytes) in your blood: basophils, eosinophils, and monocytes. White blood cells are essential for your immune system to fight infections and protect your body. An automated counter is used to accurately count these cells from a whole blood sample.
What are basophils, eosinophils, and monocytes?
Basophils are the least common white blood cells and play a key role in allergic reactions and inflammatory responses. Eosinophils help fight parasitic infections and are also involved in allergic reactions. Monocytes are the largest white blood cells; they engulf and destroy germs and damaged cells, helping to coordinate immune responses.
Why might I need this test?
Your doctor may order this test as part of a complete blood count (CBC) to check your overall health, or if you have symptoms such as fever, infection, allergic reactions, or inflammation. It helps doctors understand how your immune system is functioning and can aid in diagnosing conditions like allergies, parasitic infections, autoimmune diseases, and certain blood disorders.
How is the test done?
A healthcare professional will draw a small sample of blood from a vein in your arm using a needle. The sample is then analyzed using an automated laboratory instrument to count and classify the different types of white blood cells. The procedure only takes a few minutes and is generally not painful beyond the brief needle prick.
Reference range
Combined basophil, eosinophil, and monocyte percentage: approximately 2-12% of total leukocytes. Absolute combined count varies by instrument reference.N/A
No special patient preparation required. Fasting is not necessary.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings3
Frequently asked questions
Do I need to fast before this test?
Are there any risks from the blood draw?
What do abnormal results mean?
Will I need other tests if my results are abnormal?
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 15, 2026. · Read our editorial policy