Alcoholic Liver Disease Diagnosis and Management

Diagnostic Criteria

The American Association for the Study of Liver Diseases recommends that an AST/ALT ratio of 2.0 or higher is strongly suggestive of alcoholic liver disease, with a ratio of 5.84 indicating advanced alcoholic hepatitis or cirrhosis 1
In alcoholic hepatitis, AST/ALT ratios greater than 1.5 are seen in more than 98% of histologically proven cases, and ratios rarely exceed 2:1 in other conditions 1
The AST and ALT typically do not exceed 400 IU/mL in alcoholic hepatitis, distinguishing it from acute drug-induced liver injury or ischemic hepatitis 1

Drug-induced liver injury typically presents with AST and ALT levels greater than 400 IU/mL, which is uncommon in alcoholic hepatitis 1
The pattern of injury in drug-induced liver injury is determined by the R value, with hepatocellular injury having an R value of 5 or greater, cholestatic injury having an R value of 2 or less, and mixed injury having an R value between 2 and 5 2, 3
Ischemic hepatitis presents with dramatically elevated transaminases that rapidly decline, usually in the setting of hypotension, cardiac arrest, or severe hypoxemia 1

A comprehensive hepatic panel, including total bilirubin, direct bilirubin, albumin, INR, and GGT, should be obtained to assess synthetic function and cholestasis 4, 5
Viral hepatitis screening, including HBsAg, anti-HBc, anti-HBs, and anti-HCV with reflex RNA, should be performed to exclude chronic viral hepatitis 4, 5
A complete blood count, iron studies, and autoimmune markers, such as ANA and ASMA, should be obtained to evaluate for other potential causes of liver disease 1

The American Association for the Study of Liver Diseases recommends obtaining a FibroScan or FibroTest immediately, as normal transaminases do not exclude advanced fibrosis 4, 5
A FibroScan result greater than 12-15 kPa suggests advanced fibrosis in alcohol-related liver disease 4
Normal or mildly elevated transaminases do not exclude cirrhosis, as ALT can be normal in more than 50% of patients with advanced fibrosis 5

The discriminant function, calculated as 4.6 times the difference between the patient's prothrombin time and the control prothrombin time, plus the total bilirubin in mg/dL, can be used to assess the severity of alcoholic hepatitis, with a score of 32 or greater indicating severe disease 1
The presence of jaundice, tender hepatomegaly, and ascites suggests decompensated cirrhosis and a poor prognosis 1
Biopsy-documented alcoholic hepatitis has a 58% 4-year survival rate, with the worst outcomes in the first year if cirrhosis is present 1

The pattern of injury should be assessed using the R value: (ALT/ALT ULN)/(ALP/ALP ULN), where R≥5 indicates hepatocellular injury, R≤2 indicates cholestatic injury, and R between 2-5 indicates mixed injury, as recommended by the American Gastroenterological Association 6
Obtain detailed alcohol consumption history (current and past 3-5 days for acute, 2-4 weeks for chronic) to assess the likelihood of alcoholic liver disease, as suggested by the American Gastroenterological Association 6

Obtain ultrasound as first-line imaging to assess for steatosis, cirrhosis, and portal hypertension, as recommended by the American College of Radiology 7

Calculate FIB-4 score: age × AST / (platelet count × √ALT), where scores <1.45 have 90% negative predictive value for advanced fibrosis, while scores >3.25 have 65% positive predictive value, according to the American Association for the Study of Liver Diseases 8, 9
Calculate APRI score: (AST/AST ULN) × 100/platelet count, where values >2 suggest cirrhosis (AUROC 0.89), as recommended by the American Association for the Study of Liver Diseases 9