K-ASSAY ASO/RF/CRP Control. Level 1: 2 x 2 mL (lyophilized), Level 2: 2 x 2 mL (lyophilized). The K-ASSAY ASO/RF/CRP Control is intended for use as an assayed quality control material for monitoring the performance of the K-ASSAY Anti-Streptolysin O (ASO, Cat. No. KAI-078), Rheumatoid Factor (RF (Ver.2), Cat. No. KAI-230), C-Reactive Protein (CRP, Cat. No. KAI-026), and wide range CRP (Cat. No. KAI-082) immunoturbidimetric assays. FOR IN VITRO DIAGNOSTIC USE.