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Eosinophil count in blood (qualitative or semi-quantitative probe)

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 allergies or inflammation.

Quick summary

["Eosinophils can signal allergic reactions, infections, or other immune responses."]

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

Key facts at a glance

LOINC
96319-9
Short code
E coli DNA L resp NAA+non-prb-NCncRng
Synonyms
E coli DNA L resp NAA+non-prb-NCncRng
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
non-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 This Test Might Be Ordered

Your doctor may recommend this test if you have symptoms like persistent itching, skin rashes, asthma, or unexplained allergies. It could also be used to monitor conditions like parasitic infections, certain cancers, or autoimmune disorders.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm to draw blood. The process takes about 5 minutes, and you may feel a brief pinch. If you’re on blood thinners, let your doctor know before the test.

What the Results Mean

Results are qualitative (yes/no) or semi-quantitative (low, normal, high). High levels may suggest allergies, infections, or other conditions affecting eosinophils. Low levels might indicate immune suppression or other health concerns.

Common Conditions Monitored

Eosinophil counts are often checked in people with allergies, asthma, parasitic infections, or conditions like eosinophilic esophagitis or certain cancers.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Eosinophils play a role in allergic reactions and parasitic infections. Elevated counts may indicate ongoing immune activity, while low counts could signal immune dysfunction or other systemic issues. This test helps guide treatment decisions for allergies, infections, or inflammatory conditions.

Short name

Eosinophil Screening/Qualitative Blood Test

Frequently asked questions

What causes eosinophils to rise in the blood?
Elevated eosinophils can be caused by allergies, asthma, parasitic infections, certain cancers (like leukemia), or autoimmune diseases. Stress, medications, or other conditions may also play a role.
What if my eosinophil count is high?
If your count is high, your doctor may recommend further testing to identify the cause, such as allergy testing, blood parasite screens, or imaging studies. Treatment may include allergy medications, anti-parasitic drugs, or managing underlying conditions.
Can I eat or drink before this test?
You can eat and drink normally before this test, as no special diet or fasting is required. However, inform your doctor if you’re on any blood-thinning medications.
  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