What is this test?
ECP is a protein secreted by activated eosinophils — immune cells that are involved in some allergic and inflammatory reactions.
Why might it be ordered?
- As additional information in certain cases of asthma, atopic dermatitis or eosinophilic inflammation.
- To monitor change over time when a specialist has selected this marker for a specific purpose.
What sample is needed?
A healthcare professional collects a venous blood sample. Depending on the method, the laboratory uses serum or plasma.
How should you prepare?
Tell the laboratory about all medicines, hormone treatments, vitamins and supplements you take. Do not stop or change treatment unless your clinician tells you to. Follow any instructions about fasting and the time of collection.
How should you understand the result?
Elevation indicates activated eosinophils but does not identify a specific allergen or disease. Your result is interpreted using the reference interval on the laboratory report and in the context of your symptoms, medical history and other test findings.
Sources and editorial status
This patient-facing text is an editorial draft. It should be approved by a laboratory physician before official publication.