â¤0.2 mg/dL. Measurement of the levels of bilirubin is used in the diagnosis and treatment of liver, hemolytic, hematologic, and metabolic disorders, including hepatitis and gall bladder obstruction. The assessment of direct bilirubin is helpful in the differentiation of hepatic disorders.
Ritchie Valens. In an all too brief career, Ritchie Valens was the first Chicano rock and roll star, having his best remembered hit, La Bamba, just one month before his untimely death with Buddy Holly and the Big Bopper on February 3, 1959.
Artist Biography by Richie Unterberger. The first Hispanic rock star, Ritchie Valens will forever be known as one of the two musicians (along with the Big Bopper) who perished with Buddy Holly in 1959, when their private plane crashed in the midst of a Midwest tour.