This Standard Reference Material (SRM) is intended primarily for use in evaluating the accuracy of procedures for the determination of creatinine in human serum. It is also intended for use in validating working or secondary reference materials. A unit of SRM 967a consists of four stoppered vials of frozen human serum, two vials each at two different creatinine concentration levels. Each vial contains 1.0 mL of human serum. For more information, please refer to the SDS and COA.