question: My 16 year old son went to the doctor 3 days ago and was told he had a bad sinus infection. He was given an antibiotic and Claritin D. He was getting a little better, but still very tired. I took him back today and they I'd blood work because he was yellow. His bilirubin came back high at 4.8, all other blood work came back okay. They are wanting him to see a Gasto. How concerned should I be?