Liver Test Interpretation and Workup

• Audio chapter
  Attending-narrated, listen on the commute.
• ABIM-format MCQs
  5-option vignettes with full wrong-answer teaching.
• Study guide
  Tables, decision trees, primary sources.
• AI tutor
  Chapter-grounded, answers the question you're stuck on.

What this chapter covers

• Section 17.1: Pattern recognition and the R ratio

  Abnormal liver tests are not a diagnosis.

• Section 17.2: Hepatocellular workup

  A patient with hepatocellular injury (R over 5) gets a layered workup that is sequenced by pretest probability and reversibility.

• Section 17.3: Cholestatic workup

  Cholestatic injury (R under 2) splits cleanly along an imaging-first line, because the workup branches at whether the biliary tree is dilated.

• Section 17.4: Isolated hyperbilirubinemia

  A patient with elevated bilirubin and otherwise normal aminotransferases, alkaline phosphatase, albumin, and INR has isolated hyperbilirubinemia, and the workup splits at the very first lab: is the elevation predominantly indirect (unconjugated) or direct (conjugated)?

• Section 17.5: Isolated alkaline phosphatase elevation

  Alkaline phosphatase comes from multiple tissues and an isolated elevation does not necessarily mean liver disease.

• Section 17.6: Imaging modalities and noninvasive fibrosis

  Noninvasive assessment of liver disease has restructured hepatology over the last 15 years, and the boards expect candidates to know which test answers which question and at what cutoff.

• Section 17.7: Liver biopsy indications and techniques

  Liver biopsy has narrowed in indication as noninvasive tools have improved, but it remains the answer when staging is uncertain, when overlapping diagnoses cannot be separated by serology, when the etiology is unclear after a complete biochemical and noninvasive workup, and when transjugular access provides additional hemodynamic information that imaging alone cannot supply.

Podcast episodes

1. 01

   The R Ratio and the Two Workup Tracks

   Abnormal liver tests are a screening signal, not a diagnosis. Compute the R ratio first, commit to a track, then run the hepatocellular workup in order (viral, autoimmune, metabolic, ischemic, drug) or the cholestatic workup off a single imaging question: is the biliary tree dilated?

2. 02

   Isolated Abnormalities, Imaging, and Biopsy

   What to do when the pattern is a single abnormality or the labs alone aren't enough: isolated unconjugated versus conjugated hyperbilirubinemia, an isolated alkaline phosphatase sorted by GGT before any cholestatic workup, the noninvasive fibrosis tools, and the biopsy indications where tissue still changes management.