Eosinophil count (qualitative blood smear evaluation)
This test measures the presence and proportion of eosinophils, a type of white blood cell, in your blood. Eosinophils help fight certain infections and respond to allergic reactions.
["Eosinophils help your body defend against parasites and allergies; this test checks their levels in your blood."]
Key facts at a glance
- LOINC
- 713-8
- Short code
- Eosinophil NFr Bld Auto
- Synonyms
- Eosinophil NFr Bld Auto
- Category
- chemistry
- Sample
- whole-blood
- Container
- Lavender-top (EDTA)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- automated-count
- 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
Why This Test Might Be Ordered
Your healthcare provider may recommend this test if you have symptoms like persistent itching, skin rashes, asthma, or unexplained allergies. It could also be used to monitor conditions such as parasitic infections, certain cancers (like leukemia), or autoimmune disorders.
What to Expect Before the Test
No special preparation is needed. You’ll have a small needle inserted into your arm to draw a blood sample. The process usually takes a few minutes, and you may feel a brief pinch.
What the Test Results Mean
Eosinophil counts are qualitative, meaning results are described as elevated, normal, or low rather than a specific number. High levels may indicate allergies, infections, or other conditions requiring further evaluation.
Common Conditions Linked to Eosinophil Levels
Elevated eosinophils are often seen in allergic reactions, parasitic infections, asthma, or certain types of cancer. Low levels might suggest immune suppression or other underlying health issues.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Eosinophils play a key role in immune responses, particularly against parasites and allergens. Abnormal counts can signal underlying conditions that need medical attention, such as chronic allergies, infections, or rare blood disorders.
Short name
Eosinophil count
Frequently asked questions
What causes eosinophils to be high?
How long does it take to get results?
Can diet or medications affect eosinophil levels?
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