Included with every panel
Baseline labs come free with any panel you build.
Blood & iron
Eosinophils test
The percentage of eosinophils, white cells that fight parasites and drive allergic inflammation. Included with every panel.
At a glance
In about 5 days
Most results are ready in about 5 days. Some specialty markers can take up to 21 days.
Check before your draw
This marker has no preparation tag, but it can still need preparation. Contact us before your draw if you’re not sure.
Walk in at Quest
Your lab order arrives by email. Most Quest locations take walk-ins, so bring it with a photo ID.
What it measures
Eosinophils are white blood cells that help fight parasites and play a big part in allergies and asthma. This shows what share of your white cells they make up.
Why it matters for women
Asthma is more common in adult women than in men, and allergic conditions such as asthma, hay fever and eczema can all raise eosinophils. Some medicines and, less frequently, parasite infections can raise them too. A low result can be common and may not be a concern.
You might check it if…
- you live with asthma, hay fever or eczema
- you’ve had a rash or reaction after starting a medicine
- you’ve traveled somewhere parasite infections are common
- you’re getting a routine blood count as part of a checkup
What your result may mean
High Eosinophils: what it may mean
High eosinophils may point to allergies, asthma, eczema, a parasitic infection, a reaction to a medicine or, rarely, a blood disorder. Hay fever can push this share up as well, and asthma can be more common in adult women than in men. Because this is a percentage, it can look high just because another type of white cell has dropped, so a clinician may check the absolute eosinophil count too. Sneezing, wheezing or itchy, irritated skin can come with it, depending on the reason.
Low Eosinophils: what it may mean
Low eosinophils can be common with stress or steroid use, and they may not be a concern. This share can sit close to zero in healthy people, because eosinophils may be few in number to start with. A sudden illness can push the percentage down for a short time, and it can bounce back once you recover. The share can also fall if neutrophils rise, as can happen during a bacterial infection. You may not notice anything from a low result.
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These notes provide context and do not diagnose a condition. Not yet available in NY, NJ, RI, HI, ND, SD or WV.