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HelpTest Code AMISO Amylase, Isoenzymes, Serum
Necessary Information
Age and sex of patient are required.
Specimen Required
Collection Container/Tube:
Preferred: Serum gel
Acceptable: Red top
Submission Container/Tube: Plastic vial
Specimen Volume: 1 mL
Collection Instructions:
1. Serum gel tubes should be centrifuged within 2 hours of collection.
2. Red-top tubes should be centrifuged and the serum aliquoted into a plastic vial within 2 hours of collection.
Useful For
Ruling out salivary amylase as the cause of elevated serum amylase
Profile Information
| Test ID | Reporting Name | Available Separately | Always Performed |
|---|---|---|---|
| AMYSE | Amylase, Total, S | Yes, (Order AMS) | Yes |
| AMYPA | Amylase, Pancreatic, S | No | Yes |
| AMYSA | Amylase, Salivary, S | No | Yes |
Method Name
AMYSE, AMYPA: Colorimetric Rate Reaction
AMYSA: Calculation
Reporting Name
Amylase, Isoenzymes, SSpecimen Type
SerumSpecimen Minimum Volume
See Specimen Required
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum | Refrigerated (preferred) | 30 days | |
| Frozen | 30 days | ||
| Ambient | 7 days |
Reject Due To
| Gross hemolysis | Reject |
Clinical Information
The amylase enzymes are a group of hydrolases that degrade complex carbohydrates (starches) into simple sugars. The pancreas and salivary glands have amylase concentrations that are orders of magnitude greater than any other tissue. These two amylase isoenzymes, pancreatic and salivary, are present in serum.
Pancreatic and salivary amylase isoenzymes can be measured in serum at physiologic concentrations (within the age-specific reference interval), and elevated concentrations indicate hyperamylasemia. Hyperamylasemia can result from either increased rate of release of amylase into blood or decreased metabolic clearance of the enzyme (ie, macroamylase).
Routine amylase laboratory tests measure total amylase activity in serum and do not differentiate between amylase isoenzymes. Differentiation of amylase isoenzymes is useful in cases where amylase elevations are not thought to be from a pancreatic source.
Pancreatic amylase may be elevated due to pancreatitis as well as other conditions in which pancreatic amylase is released (eg, cannulation of the pancreatic duct) or absorbed (eg, loss of bowel integrity) into the blood. Serum pancreatic amylase should always be interpreted in a context of total amylase to determine the relative contribution of salivary and pancreatic isoenzymes.
Hyperamylasemia due to salivary amylase may occur when salivary gland disease is present. Salivary amylasemia may also be observed in conditions where there is no clinical evidence of salivary gland diseases, such as chronic alcoholism, postoperative states, lactic acidosis, anorexia nervosa or bulimia, and malignant neoplasms that secrete amylase.
Reference Values
AMYLASE, TOTAL
0-30 days: ≤6 U/L
31-182 days: 1-17 U/L
183-365 days: 6-44 U/L
1-3 years: 8-79 U/L
4-17 years: 21-110 U/L
≥18 years: 28-100 U/L
AMYLASE, PANCREATIC
0-<24 months: ≤20 U/L
2-<18 years: 9-35 U/L
≥18 years: 13-53 U/L
AMYLASE, SALIVARY
0-<18 years: Not established
≥18 years: ≤86 U/L
Day(s) Performed
Monday through Sunday
Report Available
1 to 3 daysPerforming Laboratory
Mayo Clinic Laboratories in Rochester
Test Classification
This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.CPT Code Information
82150 x 2
Forms
If not ordering electronically, complete, print, and send Gastroenterology and Hepatology Test Request (T728) with the specimen.