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Eosinophil count in serum/plasma (qualitative or semi-quantitative)

Published: August 9, 2026Updated: August 16, 2026

This test checks the presence or level of eosinophils, a type of white blood cell that helps fight certain infections and allergic reactions.

Quick summary

["Eosinophils may rise in response to allergies, infections, or other immune responses."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
22608-4
Short code
E coli VTN1 Ab Titr Stl
Synonyms
E coli VTN1 Ab Titr Stl
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 Might Be Ordered

Your doctor 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 like parasitic infections, certain cancers, or reactions to medications.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from your arm. If you’re on blood thinners, let your doctor know before the test.

What the Results Mean

Results are qualitative (present or not) or semi-quantitative (approximate levels). High eosinophil counts may indicate allergies, infections, or autoimmune conditions. Low counts might suggest stress, certain medications, or underlying health issues.

Common Conditions Monitored

Eosinophil tests help diagnose or track conditions like asthma, allergic reactions, parasitic infections, or certain cancers (e.g., Hodgkin lymphoma). They’re also used to assess responses to treatments.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical significance: Elevated eosinophils often correlate with allergic or inflammatory processes, parasitic infections, or certain autoimmune disorders. Low levels may reflect stress, medications, or other systemic factors. Results should be interpreted alongside your full medical picture by a healthcare provider.

Short name

Eosinophil test (qualitative)

Frequently asked questions

What causes eosinophils to rise?
Eosinophil counts can increase due to allergies (e.g., food, pollen), parasitic infections, asthma, certain cancers, or inflammatory conditions. Stress, medications, or infections (like fungal) may also play a role.
How long does it take to get results?
Results are typically available within 1–3 business days, depending on lab processing times. Your doctor will discuss them with you during your follow-up visit.
Can I eat or drink before this test?
No special diet is required. You can eat and drink normally, but avoid heavy meals just before the blood draw if your doctor advises it.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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