URMC / Encyclopedia / Collection Lab Tests Lactose Tolerance (Blood) Liver-Kidney Microsomal Antibody Rotavirus (Stool) Trypsin (Blood) Giardia Antigen (Stool) Pancreatic Polypeptide Salmonella Culture (Stool) Urea Nitrogen Clearance (Urine) Indirect Bilirubin Carbon Monoxide (Blood)