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Eosinophil count in serum/plasma by automated cell differential (qualitative probe)

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

This test measures the number of eosinophils, a type of white blood cell, in your blood. Eosinophils help fight certain infections and respond to allergies and inflammation.

Quick summary

["Eosinophils help your body fight parasites, allergies, and some chronic conditions."]

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

Key facts at a glance

LOINC
87373-7
Short code
E coli K88 DNA Islt Ql NAA+probe
Synonyms
E coli K88 DNA Islt Ql NAA+probe
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why Might This Test Be Done?

Your healthcare provider may order this test to check for conditions like allergies, asthma, parasitic infections, or certain blood disorders. It can also help diagnose or monitor conditions such as eosinophilic esophagitis, certain cancers, or reactions to medications.

What Does an Abnormal Result Mean?

High eosinophil counts may indicate allergies, asthma, parasitic infections, or inflammatory diseases. Low counts might suggest immune system issues or certain infections. Always discuss your results with your doctor.

How Is This Test Performed?

A small blood sample is drawn from a vein, usually in your arm. The sample is then analyzed in a lab to count eosinophils using automated technology.

What Are Common Causes of Abnormal Results?

Elevated eosinophils can be caused by allergies, asthma, parasitic infections, certain cancers, or autoimmune diseases. Reduced eosinophils may be linked to infections, immune deficiencies, or medications.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Eosinophils play a role in allergic reactions and chronic inflammatory conditions. Elevated levels can signal conditions like asthma, eosinophilic esophagitis, or parasitic infections. Low levels may suggest immune dysfunction or certain infections.

Short name

Eosinophil count

Frequently asked questions

How long does it take to get results from this test?
Results are typically available within 1 to 3 business days, depending on your lab’s processing time.
Can I eat or drink anything before this test?
No special preparation is needed for this test. However, follow any general fasting instructions your provider may give for blood tests.
Is there any risk or discomfort with this blood draw?
The blood draw may cause mild discomfort or bruising at the site, but it’s generally quick and well-tolerated. Rarely, there may be minor bleeding or swelling.
  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