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Angiotensin converting enzyme (ACE) is a protein which constricts blood vessels in order to increase blood pressure. An ACE test is normally requested to investigate sarcoidosis.

What might a low result mean?

Lower levels of ACE can be found in those with lung diseases such as COPD, cystic fibrosis, and emphysema.

What might a high result mean?

Raised levels of ACE are found in those with sarcoidosis, an inflammatory condition in which clusters of cells called granulomas form all over the body. These granulomas increase the levels of ACE in the blood.