Time of elevation of urinary amylase and serum amylase
Feb 27, 2023
Source: Cainiu Health
Dr. Zhao Xinju
Introduction
The timing of elevation for urinary amylase and serum amylase differs. Serum amylase, the main isoform of amylase in blood, is a glycoside hydrolase primarily derived from the pancreas. Serum amylase levels typically begin to rise 6 to 12 hours after onset of illness, peak at 12 to 24 hours, and generally return to normal within 48 to 72 hours.
The time course of elevation for urinary amylase and serum amylase differs.
1. Urinary Amylase
Urinary amylase begins to rise 10 to 24 hours after the onset of illness. It has a longer duration and declines more slowly than serum amylase, remaining elevated for 3 to 5 days. Acute pancreatitis is primarily caused by poor dietary habits, commonly occurring after episodes of excessive eating or drinking.
2. Serum Amylase
Serum amylase, also known as blood amylase, is the main form of amylase in the bloodstream and belongs to the glycoside hydrolase enzyme family, primarily originating from the pancreas. Serum amylase levels typically begin to increase 6 to 12 hours after symptom onset, peak at 12 to 24 hours, and generally return to normal within 48 to 72 hours. Elevated serum amylase is commonly seen in acute pancreatitis or acute exacerbations of chronic pancreatitis and is the most frequently used test for diagnosing pancreatitis.
In addition, when patients present symptoms such as abdominal pain, bloating, vomiting, and fever along with increased levels of both serum and urinary amylase, further evaluations including pancreatic CT scan, serum calcium, comprehensive metabolic panel, and electrolytes should be performed under a physician's guidance. Short-term fasting, gastrointestinal decompression, and medications such as anti-inflammatory and gastric-protective agents are part of the treatment. After recovery, special attention should be given to dietary management to prevent recurrence.
