Eosinophil count (absolute)
This test measures the number of eosinophils, a type of white blood cell, in your blood. Eosinophils help fight infections caused by parasites and play a role in allergic reactions.
["Eosinophils help your body defend against certain infections and allergies, and this test helps track their levels for diagnosis or monitoring."]
Key facts at a glance
- LOINC
- 6576-3
- Short code
- E coli VTN2 Stl Ql
- Synonyms
- E coli VTN2 Stl Ql
- Category
- chemistry
- Sample
- stool
- Container
- Clean container
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Specimen volume
- 5 g
- Stability
- Refrigerated: 24h, Frozen: 7d
- TAT
- 4–24 hours
- Order
- routine
Why This Test Is Done
Doctors may order an eosinophil count to diagnose or monitor conditions such as allergic reactions, parasitic infections, certain cancers (like leukemia), or autoimmune diseases. It can also help assess how well treatments are working for conditions affecting eosinophil levels.
What to Expect Before the Test
No special preparation is needed for this blood test. You may have a small needle inserted into your arm to draw blood, which usually causes only minor discomfort. If you’re nervous, let your healthcare provider know so they can help make the process more comfortable.
What to Expect During the Test
The blood sample is taken from a vein in your arm using a needle. You may feel a slight pinch, but the procedure takes only a few minutes. The lab technician will apply a bandage afterward to help prevent bruising.
What to Expect After the Test
After the blood is drawn, you can return to your normal activities immediately. There may be some mild bruising or redness at the site, but this usually goes away within a day or two. If you experience excessive bleeding, swelling, or pain, contact your healthcare provider.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Elevated eosinophil counts may indicate conditions like asthma, allergies, parasitic infections, or certain types of cancer. Low levels could suggest infections, immune disorders, or other systemic conditions. Your healthcare provider will interpret the results in the context of your symptoms and medical history.
Short name
Eosinophil blood count
Frequently asked questions
How long does it take to get my results?
What does a high or low eosinophil count mean?
Can I eat or drink before this test?
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