Opko Health is a diversified healthcare company that develops, manufactures, and markets diagnostic and pharmaceutical products and services. The company operates through four segments: Diagnostics, Pharmaceutical, BioReference Laboratories, and Investment. Opko Health's Diagnostics segment develops, manufactures, and markets point-of-care diagnostic products, including the 4Kscore Test, a blood test for the early detection of prostate cancer. The Pharmaceutical segment develops, manufactures, and markets pharmaceutical products, including Rayaldee, a vitamin D prohormone for the treatment of secondary hyperparathyroidism in patients with stage 3 or 4 chronic kidney disease. The BioReference Laboratories segment provides clinical laboratory testing services. The Investment segment includes investments in healthcare companies.