Angiotensin Converting Enzyme
- Sample Type
- Serum
- Fasting
- No
- Unit
- U/L
Function
Angiotensin-Converting Enzyme (ACE) is a critical enzyme primarily produced by epithelial cells in the lungs. Its fundamental physiological role is the conversion of angiotensin I into angiotensin II, a potent vasoconstrictor that regulates blood pressure and fluid balance. Additionally, ACE breaks down bradykinin, a peptide that promotes vasodilation. Together, these actions make ACE a central component of the renin-angiotensin-aldosterone system (RAAS).
Why it is Ordered
The ACE test is primarily used as a biomarker for granulomatous diseases. Clinicians order this test when a patient presents with symptoms of sarcoidosis, such as chronic cough, shortness of breath, red/teary eyes, or skin bumps. Because ACE is produced by the cells that make up granulomas (small clumps of inflammatory cells), elevated levels often reflect the total 'granuloma burden' in the body. It is also used to monitor the effectiveness of corticosteroid treatment in patients already diagnosed with sarcoidosis.
Associated Conditions
- Sarcoidosis: The most common cause of high ACE levels. Approximately 50-80% of patients with active sarcoidosis show elevated ACE.
- Gaucher Disease: A rare genetic disorder involving lipid metabolism often shows significantly high ACE.
- Hyperthyroidism: Elevated thyroid hormones can stimulate ACE production.
- Liver Disease: Conditions like cirrhosis or hepatitis can occasionally influence ACE levels.
- Lyme Disease and Leprosy: Other granulomatous infections that may lead to moderate elevations.
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Why Context Matters
A second opinion or re-test is vital if the patient is taking ACE inhibitors (e.g., Lisinopril, Enalapril) for hypertension, as these drugs will cause an artificially low result regardless of underlying disease activity. Additionally, ACE levels can vary by age (higher in children/adolescents) and can be affected by the timing of the draw or presence of hemolysis in the sample. A negative test does not rule out sarcoidosis if the disease is in an inactive phase.
Lab ranges are statistical averages, not biological laws. "Normal" for a 20-year-old male isn't normal for a 60-year-old female.
Clinical References
Source-of-truth databases and clinical guidelines for Angiotensin Converting Enzyme:
Official Sources
Research & Guidelines
Related Indicators
Medically Reviewed by Dr. Binoy Babu, MBBS
Board Certified Doctor • 10+ Years Clinical Experience
Dr. Babu is a practicing physician dedicated to empowering patients with clear, actionable medical information. He founded 2opi to bridge the gap between complex lab reports and patient understanding, ensuring everyone has access to a reliable second opinion.
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