Chronic eosinophil count (peripheral blood)
This test measures the number of eosinophils, a type of white blood cell, in your blood over time. Eosinophils help fight infections and respond to allergies or inflammation.
["Eosinophils can rise in response to certain conditions, helping your doctor track chronic health concerns."]
Key facts at a glance
- LOINC
- 107544-9
- Short code
- Chronic eosin chrom anly Bld/T FISH
- Synonyms
- Chronic eosin chrom anly Bld/T FISH
- Category
- chemistry
- Sample
- whole-blood
- Container
- Lavender-top (EDTA)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- fish
- 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 Is Eosinophil Count Used For?
Chronic eosinophil counts may be checked to monitor conditions like persistent allergies, certain infections, or inflammatory diseases. It can also help assess how your body responds to long-term treatments or conditions affecting white blood cell levels.
Why Might You Need This Test?
Your doctor may order this test if you have symptoms like persistent itching, skin rashes, unexplained weight loss, or if you’ve been diagnosed with a condition known to cause elevated eosinophil levels, such as asthma, certain cancers, or parasitic infections.
What to Expect Before the Test
No special preparation is needed. A blood sample will be taken from a vein in your arm, similar to other blood tests. You may feel a slight pinch, but it usually doesn’t cause discomfort.
What Does the Test Result Mean?
Results are compared to a general reference range for healthy adults. High levels may indicate ongoing inflammation, allergies, infections, or other underlying health issues. Your doctor will discuss the results in the context of your medical history and symptoms.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance: Elevated eosinophils can signal chronic conditions such as allergic reactions, certain lung diseases (e.g., eosinophilic pneumonia), or autoimmune disorders. Persistently low levels may suggest immune deficiencies or other systemic issues. Always consult your healthcare provider for interpretation.
Short name
Eosinophil Blood Count (Chronic)
Frequently asked questions
How often will I need this test?
What are the common causes of elevated eosinophil counts?
Will this test affect my medications?
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