ANGIOTENSIN CONVERTING ENZYME (ACE)
General Information
HLAB/HOL Code: ACE
UPHSM LIS Test #: 027200
Schedule:
Testing Time:
Testing Lab: Labcorp
UPHSM LIS Test #: 027200
Schedule:
Testing Time:
Testing Lab: Labcorp
Specimen Info
Only 1 specimen type required, unless otherwise specified
Volume: 0.5 mL
Temperature: Ambient
Tube Type: Serum
Collection Info:
Patient Preparation: Stop administration of captopril, enalapril, or lisinopril for 12 hours prior to venipuncture (reduces ACE activity).
Collection: Separate serum from cells at the time of collection.
Temperature: Ambient
Tube Type: Serum
Collection Info:
Patient Preparation: Stop administration of captopril, enalapril, or lisinopril for 12 hours prior to venipuncture (reduces ACE activity).
Collection: Separate serum from cells at the time of collection.
Specimen Acceptability
Cause for Rejection:
Captopril, enalapril, or lisinopril administration; hemolyzed or icteric specimen; whole blood, cerebrospinal fluid (CSF), or EDTA plasma specimen received
Captopril, enalapril, or lisinopril administration; hemolyzed or icteric specimen; whole blood, cerebrospinal fluid (CSF), or EDTA plasma specimen received
Methods
Kinetic
Clinical Utilities
Use:
High in sarcoidosis, more often when the disease is active. Of value in assessing the response of sarcoidosis to corticosteroid therapy. Changes in serum ACE correlate with clinical status and results of gallium scans (which reflect presence and activity of inflammatory granulomatous lesions). Falling ACE level is a favorable prognostic sign. Rising levels may reflect activity uncontrolled by therapy.
Limitations:
Elevations have been reported in about 35% to 80% of cases of sarcoidosis. ACE levels are less likely to be increased with chronic sarcoidosis. Different admixtures of acute and chronic cases may explain some of the apparent variation in reported incidence of elevation in sarcoidosis. Elevations have been found in patients with diabetes mellitus, Gaucher disease, and leprosy. Twenty-five percent of 86 patients with acute histoplasmosis had elevated levels. Increased in some patients with primary biliary cirrhosis, amyloidosis, myeloma, some alpha1-antitrypsin variants, Melkersson-Rosenthal syndrome, and hyperthyroidism. It has been found increased in some cases of hyperparathyroidism and in some instances of oncogenic hypercalcemia. Thus, it is not a specific marker for the diagnosis of sarcoidosis. Positives are also reported in patients with extrinsic allergic alveolitis, coccidioidomycosis, beryllium disease, asbestosis, silicosis, and alcoholic liver disease. ACE activity is decreased during starvation, independent of the level of thyroid activity (as monitored by T3 levels).
High in sarcoidosis, more often when the disease is active. Of value in assessing the response of sarcoidosis to corticosteroid therapy. Changes in serum ACE correlate with clinical status and results of gallium scans (which reflect presence and activity of inflammatory granulomatous lesions). Falling ACE level is a favorable prognostic sign. Rising levels may reflect activity uncontrolled by therapy.
Limitations:
Elevations have been reported in about 35% to 80% of cases of sarcoidosis. ACE levels are less likely to be increased with chronic sarcoidosis. Different admixtures of acute and chronic cases may explain some of the apparent variation in reported incidence of elevation in sarcoidosis. Elevations have been found in patients with diabetes mellitus, Gaucher disease, and leprosy. Twenty-five percent of 86 patients with acute histoplasmosis had elevated levels. Increased in some patients with primary biliary cirrhosis, amyloidosis, myeloma, some alpha1-antitrypsin variants, Melkersson-Rosenthal syndrome, and hyperthyroidism. It has been found increased in some cases of hyperparathyroidism and in some instances of oncogenic hypercalcemia. Thus, it is not a specific marker for the diagnosis of sarcoidosis. Positives are also reported in patients with extrinsic allergic alveolitis, coccidioidomycosis, beryllium disease, asbestosis, silicosis, and alcoholic liver disease. ACE activity is decreased during starvation, independent of the level of thyroid activity (as monitored by T3 levels).
CPT Codes
82164
* The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding
is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.
Reference Range
Pediatric and adults:
• 0-2 years: 18-95 units/L
• 3-14 years: 22-108 units/L
• 15 years or older: 14-82 units/L
• 0-2 years: 18-95 units/L
• 3-14 years: 22-108 units/L
• 15 years or older: 14-82 units/L
