Angiotensin Converting Enzyme test is also known as ACE test. It measures how much ACE is in your blood. If the test shows that you have higher than normal levels of ACE, you may have a condition known as sarcoidosis. In this condition, small abnormal knots of immune cells called granulomas form in various parts of the body. Also, medicines known as ACE inhibitors act on ACE levels to control blood pressure. The normal range for ACE is less than 40 nanomoles per milliliter per minute.