Macroamylasemia
Definition
Macroamylasemia is the presence of an abnormal substance called macroamylase in the blood.
Causes
Macroamylase is a substance that consists of an enzyme, called amylase, attached to a protein. Because it is large, macroamylase is filtered very slowly from the blood by the kidneys.
Most people with macroamylasemia do not have a serious disease that is causing it, but the condition has been associated with:
- Celiac disease
- Lymphoma
- HIV infection
- Monoclonal gammopathy
- Rheumatoid arthritis
- Ulcerative colitis
Symptoms
Macroamylasemia does not cause symptoms.
Exams and Tests
A blood test will show high levels of amylase. However, macroamylasemia can look similar to acute pancreatitis, which also causes high levels of amylase in the blood.
Measuring amylase levels in the urine can help tell macroamylasemia apart from acute pancreatitis. Urine levels of amylase are low in people with macroamylasemia, but high in people with acute pancreatitis.
References
Frasca JD, Velez MJ. Acute pancreatitis. In: Parsons PE, Wiener-Kronish JP, Stapleton RD, Berra L, eds. Critical Care Secrets. 6th ed. Philadelphia, PA: Elsevier; 2019:chap 52.
Siddiqi HA, Rabinowitz S, Axiotis CA. Laboratory diagnosis of gastrointestinal and pancreatic disorders. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 24th ed. Philadelphia, PA: Elsevier; 2022:chap 23.
Vege SS. Acute pancreatitis. In: Feldman M, Friedman LS, Brandt LJ, eds. Sleisenger and Fordtran's Gastrointestinal and Liver Disease: Pathophysiology/Diagnosis/Management. 11th ed. Philadelphia, PA: Elsevier; 2021:chap 58.
Review Date:10/27/2021
Reviewed By:Michael M. Phillips, MD, Emeritus Professor of Medicine, The George Washington University School of Medicine, Washington, DC. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
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Health Outcome Data
No data available for this condition/procedure.