{"type":"rich","version":"1.0","provider_name":"Transistor","provider_url":"https://transistor.fm","author_name":"Board Pearls","title":"Chapter 17, Ep 2 of 2: Isolated Abnormalities, Imaging, and Biopsy","html":"","width":"100%","height":180,"duration":1139,"description":"Episode two of the Liver Test Interpretation chapter covers what to do when a single value is up with everything else normal, or when the labs aren't the bottleneck and imaging and fibrosis assessment are. Each case forces the same question in a different form: what's the next reflex test, and does it commit you to an invasive workup or excuse you from it? Isolated bilirubin splits on direct versus indirect, isolated alkaline phosphatase splits on GGT, and the fibrosis workup runs FIB-4 before elastography before biopsy. Thresholds, mimic vignettes, and the percutaneous-versus-transjugular decision throughout.\n \nTopics covered\n\nIsolated hyperbilirubinemia and the direct versus indirect split\nSeparating hemolysis from Gilbert on the indirect side\nDirect hyperbilirubinemia: Dubin-Johnson and Rotor\nIsolated alkaline phosphatase and the GGT discriminator\nImaging modalities: structure versus fibrosis\nTransient and MR elastography cutoffs by etiology\nSerum fibrosis biomarkers and the FIB-4 sequence\nLiver biopsy indications and technique\nPercutaneous versus transjugular and the pressure gradient\n \n \nKey decisions\n\nSplit isolated hyperbilirubinemia at the first line of the panel into indirect versus direct, because the two branches share almost nothing and both are mostly benign.\nOn the indirect side, run a five-value hemolysis screen (haptoglobin, reticulocyte count, smear, LDH, direct Coombs); a clean screen in the right stem is Gilbert, and G6PD hemolysis after trimethoprim-sulfamethoxazole shows bite cells and Heinz bodies.\nTruly isolated direct hyperbilirubinemia with a normal biliary tree narrows to Dubin-Johnson (black liver, inverted urinary coproporphyrin ratio) or Rotor, both benign, so the answer is reassurance, not biopsy.\nFor isolated alkaline phosphatase, order GGT: elevated GGT confirms a hepatic source, while a normal GGT points to bone and triggers calcium, phosphorus, vitamin D, and a bone fraction or scan.\nIn the fibrosis workup, reach for FIB-4 first...","thumbnail_url":"https://img.transistorcdn.com/-FuAdDBcPDLhEoUmroZKtOBRvuBn_FHPpYlh41hOnU4/rs:fill:0:0:1/w:400/h:400/q:60/mb:500000/aHR0cHM6Ly9pbWct/dXBsb2FkLXByb2R1/Y3Rpb24udHJhbnNp/c3Rvci5mbS9iNzlh/ZTU4Y2MzNWExMjQ5/MjA5OWMwMmI3ZTk5/NGFiZS5wbmc.webp","thumbnail_width":300,"thumbnail_height":300}