What are the diagnostic criteria and work‑up for alcoholic hepatitis in an adult heavy drinker presenting with recent jaundice, fever, right‑upper‑quadrant pain, and signs of chronic liver disease?

Diagnosis of Alcoholic Hepatitis

Alcoholic hepatitis is diagnosed clinically when a patient with heavy alcohol use (>40 g/day for >6 months) presents with rapid-onset jaundice (bilirubin >3 mg/dL), AST >50 but <400 IU/L, AST/ALT ratio >1.5, and onset within 8 weeks of last drinking, after excluding alternative causes of acute hepatitis. 1

Clinical Diagnostic Criteria

The diagnosis requires all of the following elements:

• Alcohol history: Heavy drinking (>40 g/day for men, >20 g/day for women) for more than 6 months, with recent consumption within the past 60 days 1, 2
• Rapid-onset jaundice: Serum bilirubin >3.0 mg/dL developing within 8 weeks of last alcohol use 1
• Characteristic transaminase pattern: AST >50 IU/L but rarely exceeding 400 IU/L 1, 2
• AST/ALT ratio >1.5: This ratio is present in >98% of histologically confirmed cases; ratios <1.5 occur in <2% of proven alcoholic hepatitis 1, 2

Physical Examination Findings

Key clinical features that support the diagnosis include:

• Tender hepatomegaly: Commonly present on right upper quadrant examination 1, 2
• Fever: May occur even without documented infection 2
• Signs of hepatic decompensation: Ascites, hepatic encephalopathy, or variceal bleeding frequently accompany presentation 1, 2
• Stigmata of chronic liver disease: Most patients have underlying cirrhosis at diagnosis 1

Mandatory Laboratory Work-Up

Complete the following tests to confirm diagnosis and assess severity:

• Complete metabolic panel: Total and direct bilirubin, AST, ALT, alkaline phosphatase, albumin, creatinine 1
• Coagulation studies: INR/PT to calculate prognostic scores 1
• Complete blood count: Neutrophilia is frequently present; thrombocytopenia suggests underlying cirrhosis 1, 2
• Calculate severity scores immediately: Maddrey Discriminant Function (MDF) and MELD score to stratify mortality risk 1

Exclusion of Alternative Diagnoses

Before confirming alcoholic hepatitis, systematically rule out:

• Biliary obstruction: Abdominal ultrasound or CT (avoid iodinated contrast due to acute kidney injury risk) 1
• Viral hepatitis: Hepatitis A, B, and C serologies 1, 2
• Autoimmune hepatitis: ANA, smooth muscle antibody, immunoglobulin levels 1
• Wilson disease: Ceruloplasmin and 24-hour urine copper in patients <40 years 2
• Drug-induced liver injury: Detailed medication history including acetaminophen 1
• Hepatocellular carcinoma: Imaging if risk factors present 2

Infection Screening (Mandatory Before Treatment)

Obtain these studies on admission regardless of fever, as infection occurs in 20-30% of cases:

• Blood cultures: Two sets from separate sites 1, 3
• Urine culture: With urinalysis 1, 3
• Diagnostic paracentesis: If ascites present, send fluid for cell count, culture, albumin 1, 3
• Chest radiograph: To exclude pneumonia 3

Three-Tiered Diagnostic Classification

The AASLD consensus framework categorizes patients to guide biopsy decisions 1, 2:

Probable Alcoholic Hepatitis

• Clinical criteria met with typical presentation
• No confounding factors present (atypical labs, unclear history, concurrent medications)
• Liver biopsy not required for diagnosis or treatment decisions 1, 2

Possible Alcoholic Hepatitis

• Clinical features present but confounding factors exist:
  • AST/ALT ratio <1.5
  • Transaminases >400 IU/L
  • Unclear or inconsistent alcohol history
  • Concurrent hepatotoxic medications
• Liver biopsy strongly recommended, especially before initiating corticosteroids 1, 2
• Clinical diagnosis alone carries 10-50% risk of misclassification 2

Definite Alcoholic Hepatitis

• Clinical diagnosis plus histologic confirmation showing:
  • Macrovesicular steatosis plus at least one of: neutrophil infiltration, hepatocyte ballooning, or Mallory-Denk bodies 1, 2
  • Additional features may include perivenular fibrosis, megamitochondria, cholestasis 1

Role of Liver Biopsy

Transjugular liver biopsy (preferred over percutaneous due to coagulopathy and ascites) is indicated when 1, 2:

• Confounding factors are present (possible alcoholic hepatitis category)
• Atypical laboratory pattern (AST/ALT <1.5, transaminases >400 IU/L)
• Diagnostic uncertainty exists before initiating high-risk therapy
• Corticosteroid therapy is being considered for severe disease (MDF ≥32 or MELD >20)

Biopsy is not required for routine diagnosis in typical presentations or for prognostic assessment 1, 4

Assessment for Acute-on-Chronic Liver Failure (ACLF)

Evaluate for extrahepatic organ failures using CLIF-SOFA criteria 2, 5:

• Kidney failure: Creatinine ≥2.0 mg/dL 2
• Brain failure: Grade III-IV hepatic encephalopathy 2
• Circulatory failure: Vasopressor requirement 2
• Respiratory failure: PaO₂/FiO₂ <200 or mechanical ventilation 2
• Coagulation failure: INR >2.5 2

Alcoholic hepatitis precipitates ACLF in 30-57% of Western cases; presence of organ failures dramatically worsens prognosis (28-day mortality 31-72%) 2, 5

Severity Stratification

Calculate these scores immediately to guide treatment decisions:

• Maddrey Discriminant Function: MDF = 4.6 × (PT - control PT) + bilirubin (mg/dL)

  • MDF ≥32 defines severe disease with 40-50% 90-day mortality without treatment 1, 3
  • This threshold triggers consideration of corticosteroid therapy 1

• MELD score: Uses bilirubin, INR, creatinine

  • MELD >20 indicates severe disease with high 90-day mortality 1
  • MELD >26 warrants liver transplantation evaluation 6

• Glasgow Alcoholic Hepatitis Score ≥9 or ABIC category C also predict high short-term mortality 1

Common Diagnostic Pitfalls

• Failing to obtain family corroboration of alcohol history leads to underdiagnosis 2
• Assuming fever indicates infection: Fever occurs in alcoholic hepatitis even without infection, but infection must still be excluded 2, 3
• Relying on clinical diagnosis alone when confounding factors exist results in 10-50% misclassification 2
• Ordering ERCP or MRCP unnecessarily delays treatment; simple ultrasound excludes biliary obstruction 3
• Using iodinated contrast for imaging markedly increases acute kidney injury risk 6
• Missing underlying cirrhosis: 70-80% of alcoholic hepatitis patients have cirrhosis at presentation 1

Identifying Underlying Cirrhosis

Recognize cirrhosis through 2:

• Imaging findings: Liver nodularity, portal-systemic collaterals, splenomegaly, caudate lobe hypertrophy 2
• Laboratory markers: Thrombocytopenia, hypoalbuminemia, prolonged INR 2
• Clinical stigmata: Spider angiomata, palmar erythema, gynecomastia 2

Next Steps After Diagnosis

Once alcoholic hepatitis is confirmed:

1. Enforce absolute alcohol abstinence – the single most important intervention for long-term survival 6, 3
2. Initiate aggressive nutritional support: 30-40 kcal/kg/day, 1.0-1.5 g protein/kg/day 1, 3
3. Administer thiamine 500 mg IV three times daily for 3-5 days before glucose-containing fluids 3
4. For severe disease (MDF ≥32 or MELD >20) without contraindications: Start prednisolone 40 mg daily after infection is excluded 1, 3
5. Calculate Lille score on day 7 of corticosteroid therapy to assess response 1, 3