| Marker | Gabriel optimal | Typical lab range | Functional range |
|---|---|---|---|
| Eosinophils % | 3 or lower % | 7 or lower | 3 or lower |
What eosinophils do
Eosinophils are a small share of your white cells, usually under 5%. Their granules release proteins that damage parasites, and they take part in allergic reactions and inflammation. Cleveland Clinic gives a typical count of about 30 to 350 per microliter. See the WBC differential lab guide.
How high is high
| Absolute eosinophil count | Grade |
|---|---|
| Above 500 per microliter | Eosinophilia |
| 500 to 1,500 | Mild |
| 1,500 to 5,000 | Moderate |
| Above 5,000 | Severe |
A percent alone can mislead, because it depends on your total WBC. The absolute count is the number that sets the grade.
What high eosinophils can mean
- Allergic conditions: hay fever, allergic asthma, eczema and other allergic skin conditions. These usually cause mild to moderate rises.
- Medicine reactions. A rare, serious one called DRESS (drug reaction with eosinophilia and systemic symptoms) needs urgent care; seizure medicines such as carbamazepine and lamotrigine, allopurinol and sulfa antibiotics carry the highest risk.
- Parasitic infections, especially after travel or time in tropical regions. Stool tests can miss them, so a negative test doesn't fully rule them out.
- Gut conditions such as eosinophilic esophagitis, the most common eosinophil-related condition.
- Lung conditions such as eosinophilic asthma.
- Less common: some blood cancers and solid tumors, and hypereosinophilic syndrome, where high eosinophils damage organs without another cause.
People who have lived in or traveled to tropical areas should be checked for a parasite called Strongyloides before taking steroids, because steroids can let it spread dangerously.
Low eosinophils and Gabriel's optimal range
A low eosinophil count is often harmless on a single test. It has been linked to Cushing syndrome and severe infection (sepsis). Typical lab ranges for eosinophil percent run up to about 7%, depending on the lab. Gabriel's optimal ceiling is 3%. A count that stays above that is a cue to look at allergies, asthma, gut symptoms, medicines and travel history with your clinician.
What to do with a high result
- Get the absolute count and read it with the rest of the CBC.
- List your medicines and supplements, including anything you started recently.
- Share your travel, food and pet history and any allergy, asthma, skin or swallowing symptoms.
- Ask what follow-up fits. Depending on the story, that may be stool tests for parasites, a chest X-ray, liver and kidney tests or a referral to allergy or hematology.
- If you have a report in hand, you can upload it to Gabriel for a plain-words read of every marker, then take your questions to your clinician.
Seek care the same day for a new rash with fever, facial swelling or skin peeling after starting a medicine, or for shortness of breath or chest pain with a high eosinophil count. See a clinician soon for food sticking when you swallow, ongoing belly pain or diarrhea after travel, or a count that stays above 1,500.
Common questions
What is a normal eosinophil count?
About 30 to 350 per microliter, usually under 5% of white cells, though ranges vary by lab. Gabriel's optimal ceiling for eosinophil percent is 3%.
Can allergies cause high eosinophils?
Yes. In the United States, allergic conditions such as hay fever, asthma and eczema are the most common cause, usually with a mild to moderate rise.
What level of eosinophils is dangerous?
Counts that stay at or above 1,500 per microliter can damage organs over time and need a full workup. Mild eosinophilia alone usually causes no symptoms.
Can parasites cause high eosinophils?
Yes, especially worms picked up during travel or in tropical regions. Tell your clinician about any travel, since travel history is one of the key clues.
Are high eosinophils a sign of cancer?
Rarely. A persistently high count is occasionally linked to blood cancers or solid tumors, which is why an unexplained count that stays high gets a full workup.
Sources
- Eosinophils Cleveland Clinic
- Eosinophilia Merck Manual Professional Edition
- Evaluation of Patients with Leukocytosis (Riley and Rupert, 2015) American Family Physician
- Blood Differential MedlinePlus, U.S. National Library of Medicine
This guide is general information, not medical advice. It does not replace a visit with a licensed clinician. Gabriel membership is not health insurance.