Thermo Scientific HyClone Characterized Fetal Bovine Serum (FBS), U.S. Origin, meets virus testing requirements (9 CFR 113.53) and provides additional testing service than HyClone Standard FBS.HyClone Characterized Fetal Bovine Serum, U.S. origin, is filtered using 100nm (0.1µm) pore-size filters and processed using ""True Pool"" processing technology to ensure consistency in the quality of serum. HyClone Characterized FBS is widely used by professionals requiring an extensive biochemical profile and full traceability compliant with current Good Manufacturing Practices (cGMP). Characterized FBS is <= 25EU/mL Endotoxin and <= 25mg/mL Hemoglobin.