- Liver or kidney dysfunction/failure- Patients will have blood drawn for serum laboratory tests, including creatinine, blood urea nitrogen (BUN), aspartate aminotransferase (AST), alanine aminotransferase test (ALT), and bilirubin. All of these must be within normal limits for a patient to be included in the study. Current University of Michigan Health System normal lab values are as follows: Creatinine (male 0.7-1.3 mg/dl; female 0.5-1.0 mg/dl); BUN (8-20 mg/dl); AST (8-30 IU/L); ALT (7-35 IU/L); Bilirubin (0.2-1.2 mg/dl).