4-hydroxybutyric aciduria

4-hy·drox·y·bu·tyr·ic ac·i·du·ri·a

(hī-drok'sē-byū-tir'ik as'i-dū'rē-ă), Elevated levels of 4-hydroxybutyrate in the urine. An inherited disorder that can lead to hypotonia and mental retardation.