Amanda Bayless, , , , , , Komal Dahya, Katherine Earl, Chui Tse, Uliana Danilenko, Hubert Vesper Standard Reference Material (SRM) 965c Glucose in Frozen Human Serum is intended for use in validating methods for the determination of glucose in human serum and plasma. A unit of SRM 965c consists of three ampoules each of four materials: Level 1, Level 2, Level 3, and Level 4. Each ampoule contains approximately 1.0 mL of frozen serum.