Management of Left Upper Quadrant Pain with Elevated Liver Enzymes and Normal CT

Diagnostic Approach

The American College of Radiology recommends obtaining abdominal ultrasound immediately and completing a comprehensive hepatobiliary workup, as CT has limited sensitivity for early hepatic steatosis, biliary pathology, and mild liver injury that commonly cause this clinical presentation 1, 2
CT abdomen/pelvis is not useful as a first-line modality for diagnosing mildly elevated aminotransferases due to failure to detect early steatosis, lack of accuracy for mild fatty infiltration, and inability to reliably assess hepatocellular injury patterns 1, 2
Ultrasound is the recommended first-line imaging modality with 84.8% sensitivity and 93.6% specificity for detecting moderate-to-severe hepatic steatosis, and can identify biliary obstruction, focal liver lesions, and portal hypertension features that CT may miss 4, 5

A complete liver panel, including AST, ALT, alkaline phosphatase, GGT, total and direct bilirubin, albumin, PT/INR, should be obtained immediately to establish injury pattern and guide further workup 4
Viral hepatitis serologies, including HBsAg, anti-HBc IgM, anti-HCV antibody, should be obtained as viral hepatitis commonly presents with fluctuating transaminase elevations and left upper quadrant discomfort 5

If ultrasound shows hepatic steatosis, implement lifestyle modifications immediately, including a low-carbohydrate/low-fructose diet and 150-300 minutes of moderate-intensity aerobic exercise weekly, and calculate FIB-4 score to assess risk for advanced fibrosis 5, 7
If ultrasound shows biliary dilation or obstruction, order MRI abdomen with MRCP urgently, as this is the most useful modality for evaluating biliary obstruction etiology with 90.7% accuracy for detecting biliary confluence obstruction 4

Ischemic liver injury, also known as shock liver, is a serious condition that can progress to liver failure with high mortality and requires immediate evaluation for hemodynamic instability, cardiac dysfunction, or systemic hypoperfusion 1, 2
Acute viral hepatitis, including hepatitis A, B, C, or drug-induced liver injury, can present with left upper quadrant pain and moderate transaminase elevations and should be excluded urgently 1, 7

Repeat liver enzymes in 2-4 weeks to establish trend if initial workup is unrevealing and enzymes are <5× ULN, and consider urgent hepatology referral if ALT increases to >5× ULN or bilirubin >2× ULN 5
If enzymes remain elevated for ≥6 months without identified cause, refer to hepatology for consideration of liver biopsy 5