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Eosinophil count (qualitative, manual differential blood cell count)

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

This test measures the number of eosinophils, a type of white blood cell, in your blood using a manual microscopic examination. Eosinophils help fight certain infections and allergic reactions.

Quick summary

["Eosinophil counts help identify potential allergic or parasitic conditions."]

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

Key facts at a glance

LOINC
71622-5
Short code
Eosinophil NFr.DF Snv Manual
Synonyms
Eosinophil NFr.DF Snv Manual
Category
chemistry
Sample
fluid
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
manual-count
Specimen volume
2-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
Hemolysis max
300
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your healthcare provider may order this test to check for conditions like allergic reactions, parasitic infections, certain types of asthma, or other immune-related disorders. It can also be used to monitor treatment progress for conditions affecting eosinophils.

What to Expect Before the Test

No special preparation is needed for this test. You’ll typically have a small needle inserted into your arm to draw blood. The blood sample is then examined under a microscope by a trained technician to count eosinophils.

What the Test Results Mean

Results are qualitative (qualitative means they describe whether the count is high, low, or normal rather than providing a specific number). High eosinophil counts may suggest allergies, infections, or other conditions. Low counts might indicate immune suppression or other health issues.

Common Conditions Linked to Eosinophil Counts

Elevated eosinophil counts can be linked to conditions such as allergic reactions, asthma, parasitic infections, certain cancers (like Hodgkin lymphoma), or inflammatory diseases. Low counts may be associated with autoimmune disorders or immune system disorders.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Eosinophil count (qualitative)

Frequently asked questions

How often do I need this test?
This test is often ordered as needed, depending on your symptoms or medical condition. Your healthcare provider will determine how frequently you need it based on your specific situation.
What are the normal ranges for eosinophils?
Since this is a qualitative test, there are no specific numeric reference ranges. Instead, results are interpreted based on whether the eosinophil count is elevated, reduced, or within normal limits for your situation.
Can I eat or drink before this test?
No dietary restrictions are required for this test. You can eat and drink normally before having your blood drawn.
  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