In a patient with elevated transaminases, hyperbilirubinemia, a prothrombin time of 15.3 seconds, and no varices, what medication should be administered?

Vitamin K should be administered immediately, followed by diagnostic workup to determine if this is autoimmune hepatitis requiring corticosteroid therapy.

Immediate Management

The prolonged PT (15.3 seconds) with elevated bilirubin and transaminases requires urgent correction of coagulopathy with vitamin K (10 mg IV or subcutaneously). This addresses potential vitamin K deficiency from cholestasis and is a critical first step before any invasive procedures like liver biopsy 1.

Diagnostic Approach

Your clinical presentation—elevated transaminases, hyperbilirubinemia, and prolonged PT without varices—strongly suggests autoimmune hepatitis (AIH) until proven otherwise. The absence of varices indicates this is not advanced portal hypertension, but the coagulopathy (PT 15.3) signals significant hepatic synthetic dysfunction.

Key diagnostic steps:

• Check autoantibodies immediately: ANA, SMA (>1:80), anti-LKM, anti-SLA/LP 2
• Measure IgG levels: Elevated IgG supports AIH, though normal levels don't exclude it 2
• Exclude viral hepatitis: HBV, HCV, HAV, HEV serology 2
• Review all medications: Consider drug-induced autoimmune-like hepatitis (DI-AILH) and stop any suspected precipitants 3
• Liver biopsy: Essential if diagnosis unclear, showing interface hepatitis and plasma cell infiltration in AIH 2

Definitive Treatment Decision

If AIH is confirmed or highly suspected:

Start prednisolone 0.5 mg/kg/day (up to 40 mg/day) if any of the following are present 3:

• Jaundice (which you have—elevated bilirubin)
• PT prolongation (which you have—15.3 seconds)
• Failure of transaminases to normalize within 1 week

This patient meets criteria for immediate corticosteroid therapy based on the combination of jaundice and coagulopathy.

If drug-induced liver injury is suspected:

• Stop the offending drug immediately 3
• If transaminases don't fall substantially within one week, start prednisolone as above 3
• Perform liver biopsy if no prompt resolution 3

Critical Pitfalls to Avoid

1. Don't wait for biopsy to start treatment: With jaundice and coagulopathy, treatment should begin promptly while awaiting biopsy results 3

2. Don't use PT/INR to predict bleeding risk: These tests don't accurately reflect hemostasis in liver disease and shouldn't guide prophylactic transfusion decisions 1

3. Don't dismiss AIH if IgG is normal: Up to 20% of AIH patients have normal IgG at presentation 2

4. Consider N-acetylcysteine if acute liver failure develops: If hepatic encephalopathy emerges or PT worsens dramatically, add NAC 100-150 mg/kg/day and discuss with a transplant center urgently 4

Monitoring and Escalation

• Serial PT, bilirubin, and transaminases every 2-3 days initially
• If PT continues to worsen or hepatic encephalopathy develops: This represents acute liver failure—contact a transplant center immediately and consider NAC therapy 4
• Response to steroids typically occurs within weeks: Expect transaminase improvement before bilirubin normalization

The 2025 BSG and EASL guidelines emphasize that AIH with jaundice and coagulopathy represents moderate-to-severe disease requiring prompt immunosuppression to prevent progression to liver failure and improve mortality 2, 3.