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Eosinophil count in serum/plasma (qualitative titration-based method)

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

This test checks the presence of eosinophils, a type of white blood cell, in your blood serum or plasma using a qualitative titration method.

Quick summary

["Eosinophils help identify certain allergic reactions or infections."]

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

Key facts at a glance

LOINC
5137-5
Short code
ECV1 Ab Titr Ser CF
Synonyms
ECV1 Ab Titr Ser CF
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
comp-fix
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

What Is an Eosinophil?

Eosinophils are a type of white blood cell that play a role in fighting off parasites, managing allergic responses, and reducing inflammation. They are typically measured in blood tests to diagnose conditions like asthma, allergies, or certain infections.

When Might You Need This Test?

Your doctor may order this test if you have symptoms like persistent itching, skin rashes, asthma, or unexplained allergic reactions. It can also be used to monitor conditions like eosinophilic esophagitis or certain parasitic infections.

How Is the Test Performed?

A blood sample is drawn from a vein, usually in your arm. The serum or plasma is then analyzed using a titration method to determine eosinophil presence qualitatively (yes/no). No specific numeric result is provided.

What Does a Positive Result Mean?

A positive result indicates an elevated presence of eosinophils, which may suggest an allergic reaction, parasitic infection, or other inflammatory conditions. Further testing or clinical correlation is needed to determine the exact cause.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Eosinophil Screen (Qualitative)

Frequently asked questions

Why did my doctor order this test?
Your doctor may have suspected an allergic reaction, parasitic infection, or another condition linked to eosinophil elevation based on your symptoms or medical history.
What are the typical reference ranges for this test?
This test is qualitative, so it does not provide a numeric reference range. Instead, it indicates whether eosinophils are present above normal levels.
Can I eat or drink before this test?
No special preparation is needed for this test. However, follow any general fasting instructions your doctor may have given for blood tests.
  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