K-ASSAY Fibrinogen Control. Level 1: 5 x 1 mL (lyophilized), Level 2: 5 x 1 mL (lyophilized). The K-ASSAY Fibrinogen Control is intended for use in the quality control of fibrinogen assays, for example the K-ASSAY Fibrinogen immunoturbidimetric assay (Cat. No. KAI-135). FOR IN VITRO DIAGNOSTIC USE.