MCQ Medicine Answer 18
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(Harrison’s 16th Ed., 1891)
The serum Amylase is widely used as screening test for acute pancreatitis.
- A value >65U/L should raise the question of acute pancreatitis. Levels >130U/L make the diagnosis more likely, and values greater than three times normal virtually clinch the diagnosis if gut perforation or infarction is excluded.
- It is elevated within 24 hrs of onset and remains so for 1-3 days. Levels return to normal within 3-5 days unless there is extensive pancreatic necrosis, incomplete ductal obstruction or pseudocyst formation.
- Approx. 85% will have a raised amylase level.
- Levels may be normal if there is a delay before blood samples are taken, chronic pancreatits, or if hypertriglyceridemia is present.
- 20-40% false negatives and positives
Tags: MCQ, Medicine, Pancreatitis
Category: Internal Medicine MCQs , Medicine MCQs
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