ELEVATED LIVER ENZYMES
ELEVATED LIVER ENZYMES
Eric F. Martin, MD
Transplant Hepatology Assistant Professor of Clinical Medicine Medical Director of Living Donor Liver Transplant University of Miami ~ Miami Transplant Institute
Financial Disclosures
? None
Objectives
1. Identify the components of the liver biochemistry profile and understand their meaning if abnormal
2. Identify and understand the significance of the true liver function test "LFTs"
3. Develop a differential diagnosis for abnormal liver biochemistries, including AST and/or ALT >1000
4. Follow an organized approach to evaluate abnormal liver biochemistries
Introduction
? Evaluation of abnormal liver enzymes in an otherwise healthy patient may pose challenge to most experienced clinician
? May not be necessary to pursue extensive evaluation for all abnormal tests, due to unnecessary expenses and procedural risks
? On the other hand, failure to investigate mild or moderate liver enzyme abnormalities could mean missing the early diagnosis of potentially lifethreatening, but otherwise treatable conditions
? Liver enzymes are readily available and included in many routine labs ? Estimated that 1%-9% of asymptomatic patients have elevated liver
enzyme levels when screened with standard "liver function panels" ? All persistent elevations of liver enzymes require methodical evaluation
and appropriate working diagnosis
Am J Gastroenterol 2017;12:18-35
Introduction
? The following tests are recommended by the American Association
for the Study of Liver Disease (AASLD) and the National Academy of
Clinical Biochemistry (NCAB) to be used to evaluate patients with
known or suspected liver disease
- Aspartate aminotransferase (AST) - Alanine aminotransferase (ALT)
Markers of hepatocellular injury
- Alkaline phosphatase (ALP)
- Total bilirubin - Direct bilirubin
Markers of cholestasis
- Total protein
- Albumin - Prothrombin time (PT)/INR
True liver function tests ("LFTs")
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