Fresenius Medical Care, the world’s largest provider of dialysis products and services, today announced that Standard & Poor’s has upgraded Fresenius Medical Care’s corporate credit rating to BBB with a stable outlook from BBB- with a positive outlook. Fresenius Medical Care is rated investment grade by the three leading rating agencies Standard & Poor’s (BBB/stable), Moody's (Baa3/stable) and Fitch (BBB-/stable).