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Eosinophil Count (Manual Differential Blood Count)

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 infections caused by parasites and play a role in allergic reactions.

Quick summary

["Eosinophils help protect your body from harmful substances and infections."]

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

Key facts at a glance

LOINC
32014-3
Short code
Eosinophil NFr Ur Manual
Synonyms
Eosinophil NFr Ur Manual
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
manual-count
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your doctor may order this test if you have symptoms like persistent itching, skin rashes, asthma, or unexplained allergies. It can also help diagnose conditions such as parasitic infections, certain cancers, or autoimmune diseases.

What to Expect Before the Test

You won’t need special preparation. The test involves a simple blood draw from a vein, usually in your arm. The blood sample is then examined under a microscope to count eosinophils.

What the Results Mean

Elevated eosinophil counts may indicate allergic reactions, parasitic infections, or other inflammatory conditions. Lower-than-normal counts might suggest immune system issues or certain medications.

Common Conditions Linked to Eosinophil Levels

High eosinophil levels can be linked to conditions like asthma, hay fever, certain cancers (e.g., lymphoma), or parasitic infections. Low levels may be associated with immune deficiencies or chronic illnesses.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical significance: Eosinophils are involved in immune responses to allergens and parasites. Abnormal counts can signal underlying health concerns that require further evaluation by your healthcare provider.

Short name

Eosinophil Test

Frequently asked questions

How long does it take to get my test results?
Results are typically available within one to three business days, depending on lab processing times. Your doctor will discuss the findings with you during your follow-up visit.
What does it mean if my eosinophil count is higher than usual?
An elevated eosinophil count may suggest an allergic reaction, parasitic infection, or other inflammatory conditions. Your doctor will review your symptoms and may recommend additional tests to determine the cause.
Can I eat or drink anything before this test?
No special diet or fasting is required for this test. You can eat and drink normally, as the blood draw is quick and doesn’t affect the results.
  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