The ACE (Angiotensin-Converting Enzyme) test is a blood test used to measure the level of ACE enzyme in the body, primarily for the diagnosis and monitoring of sarcoidosis—an inflammatory disease characterized by the formation of granulomas in organs. This enzyme is produced by epithelioid cells in granulomas and is often elevated in patients with active sarcoidosis.
However, ACE levels may also be elevated in other conditions such as leprosy, Gaucher’s disease, or certain infections, and sometimes naturally higher in healthy individuals, especially children. On the other hand, normal ACE levels do not rule out sarcoidosis, as some patients may have normal levels despite having active disease.
The diagnostic method is usually ELISA (Enzyme-Linked Immunosorbent Assay). Interpretation of results should be made in conjunction with clinical symptoms (e.g., shortness of breath, skin lesions), imaging (e.g., chest X-ray), or tissue biopsy.
This test is also helpful for evaluating treatment response and disease prognosis, but it is not sufficient alone for a definitive diagnosis.
