简介内容:Norcholic acid is a bile acid and 23-carbon derivative of cholic acid .1Levels of norcholic acid are increased in the urine of patients with liver cirrhosis or cerebrotendinous xanthomatosis (CTX), an inborn error of metabolism characterized by a deficiency in the mitochondrial enzyme sterol 27-hydrolylase (CYP27A1) that leads to progressive neurological ,3,4