Blood Levels of the Most Common PFAS in People in the United States from 2000–2014. Originally published in Fourth Report on Human Exposure to Environmental Chemicals, Updated Tables, (January 2017). Atlanta, GA: U.S. Department of Health and Human Services (HHS), Centers for Disease Control and Prevention (CDC). This figure is freely available on the agency’s website and its use does not imply endorsement of this manuscript by CDC, HHS, or the United States Government. PFAS (per- and polyfluoroalkyl substances, PFOA (perfluorooctanic acid), PFHxS (perfluorohexane sulfonic acid), PFNA (perfluorononanoic acid).