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Eosinophil count (qualitative manual differential blood cell count)

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

This test checks the number of eosinophils, a type of white blood cell, in your blood. Eosinophils help fight certain infections and respond to allergic reactions.

Quick summary

["Eosinophils help your body defend against parasites and allergies, but too many can signal underlying conditions."]

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

Key facts at a glance

LOINC
95216-8
Short code
Eosinophil NFr Stem prod Manual
Synonyms
Eosinophil NFr Stem prod Manual
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
manual-count
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 This Test Is Done

Doctors may order this test to investigate symptoms like persistent itching, skin rashes, asthma, or unexplained allergies. It can also help diagnose conditions like parasitic infections, certain cancers, or allergic disorders.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm or hand for a blood draw, similar to other routine blood tests. The process takes a few minutes.

What the Results Mean

Results are qualitative (qualitative means they describe whether levels are high, low, or normal rather than providing a specific number). High eosinophil counts may indicate allergies, infections, or other conditions requiring further evaluation.

Common Conditions Linked to Eosinophil Counts

Elevated eosinophils are often seen in allergic reactions, parasitic infections, certain lung diseases (like asthma or eosinophilic pneumonia), or autoimmune disorders. Low counts may suggest immune system issues or certain blood disorders.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Eosinophil count

Frequently asked questions

What causes elevated eosinophils?
Elevated eosinophils can result from allergies, parasitic infections, certain lung diseases, or conditions like asthma, eosinophilic esophagitis, or inflammatory bowel disease. Your doctor will consider your symptoms and other test results to determine the cause.
How long does it take to get results?
Results are typically available within 24 to 48 hours, depending on your lab’s processing schedule. Your doctor will discuss the findings with you during your follow-up visit.
Can I eat or drink before this test?
No special diet or fasting is required for this test. You can eat and drink normally before your blood draw.
  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