ECP (eosinophil cationic protein)
ECP is a protein released by activated eosinophils — white blood cells active in allergic and parasitic responses. Elevated ECP indicates that eosinophils are active.
| Rating | Range | What it means |
|---|---|---|
| Good | below 13.3 µg/L | ECP within range. |
| Worth improving | 13.3 – 24 µg/L | Mildly elevated — possible eosinophilic (allergic) activity; interpret in context. |
| Talk to a doctor | 24 µg/L and above | Elevated — indicates eosinophilic/allergic inflammation; interpret with symptoms. |
Why it matters
It reflects the intensity of eosinophilic (often allergic) inflammation.
If it’s low
Low ECP is of no clinical significance.
If it’s high
Elevated ECP accompanies active allergic/eosinophilic inflammation (asthma, atopic dermatitis, allergic rhinitis), and can also occur in parasitic infections. On its own it is not a diagnosis.
What to do
Elevated ECP alone does not require action — context matters (symptoms, eosinophils, IgE). If you have allergic problems, discuss its significance with a physician/allergist. The sample must be handled correctly, otherwise the value may be falsely high.
Read together with
Eosinophils (abs.) · IgE (total)
This content is for information only and is not a substitute for medical advice. Talk to your doctor about your results.
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