Quotient is a commercial-stage diagnostics company. Co. focuses on blood grouping and donor disease screening, which is referred to as transfusion diagnostics. Blood grouping involves specific procedures performed at donor or patient testing laboratories to characterize blood, which includes antigen typing and antibody detection. Disease screening involves the screening of donor blood for unwanted pathogens using two different methods, a serological approach (testing for specific antigens or antibodies) and a molecular approach (testing for DNA or RNA). Co. is developing MosaiQ, its proprietary technology platform and a third microarray for molecular disease screening.