Eosinophil cationic protein (ECP)

Explanation

ECP is a protein released when eosinophils become active. Eosinophils are a type of white blood cell involved in some allergic and other inflammatory reactions. A blood test measures ECP.

What can an increased value mean?

ECP can rise in several conditions involving inflammation, including some forms of asthma and allergic disease. It is not specific to one condition, so a high result does not confirm asthma or identify a particular allergy.

How is it used with other findings?

In selected situations, ECP may help assess inflammatory activity. Its meaning depends on symptoms, the suspected condition and other tests.

Measuring a protein released by eosinophils is different from counting these cells in a blood count. Ask which question the ECP measurement is meant to answer and whether changes over time are relevant to your care.

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