I just had bllod work done at a health fair. Everything was normal. AST,ALT Alubumin,glogulin, Alk Phos., iron,etc all normal. the exception was total bilirubin which as 2.3, normal 02-1.2 and dircect bilirubin .4 normal is 0.0-.2. why is that? if all the other liver enzymes are fine should I be concerned?