label: Elevated urinary succinylacetone level
label_lc: elevated urinary succinylacetone level
description: "Presence in the urine of succinylacetone, which is one of the toic block metabolites formed in tyrosinaemia type 1 because of a defect in the final enzyme of the pathway of the degradation of tyrosine, namely fumarylacetoacetase (FAH, EC 3.7.1.2)."