[1] Diagnostic tests that can contribute to the diagnosis of sarcoidosis include serum angiotensin-converting enzyme (ACE), conventional chest radiograph, high-resolution chest computed tomography (CT), broncho-alveolar lavage and fluorodeoxyglucose-positron emission tomography (FDG-PET).[2] Undetected sarcoidosis can lead to substantial morbidity. The gene discussed is ACE; the disease is sarcoidosis.