A 15-yeаr-оld presents with jаundice, INR 3.8, аnd encephalоpathy that began 4 days agо. She has no prior liver disease. AST 5,200 U/L, ALT 4,800 U/L. Serum acetaminophen level is undetectable. What additional test should be obtained URGENTLY to identify a treatable etiology?
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