Should I Get a PFAS Blood Test?
It depends on your likely exposure. The National Academies of Sciences, Engineering, and Medicine recommended in 2022 that clinicians offer PFAS blood testing to patients likely to have a history of elevated exposure, such as people exposed at work or living in areas known to be contaminated.
The National Academies set two thresholds for PFAS in blood serum. Below 2 nanograms per milliliter, clinicians should give the usual standard of care, and at 20 or higher they should encourage reducing exposure if a source is identified. The Agency for Toxic Substances and Disease Registry notes the National Academies’ estimate that 98 percent of people in 2017 to 2018 national survey data were at 2 or above and 9 percent at 20 or above.
A test has limits. The agency says a PFAS blood test will not identify a current or future health problem or provide information on treatment, and that blood levels do not predict future health outcomes. It says the tests are most useful as part of a scientific investigation or health study.
Sources checked September 15, 2026. Every point below links the page it came from.
The sources behind this answer
- Government sourceThe National Academies’ 2022 report recommends that clinicians offer PFAS blood testing to patients likely to have a history of elevated exposure, such as those with occupational exposure or living in areas known to be contaminated. National Academies of Sciences, Engineering, and Medicine ↗
- Government sourceThe National Academies recommend that clinicians treat patients with serum PFAS below 2 nanograms per milliliter with the usual standard of care. National Academies, via NIH Bookshelf ↗
- Government sourceFor patients at 20 nanograms per milliliter or higher, the National Academies recommend that clinicians encourage PFAS exposure reduction if a source of exposure is identified. National Academies, via NIH Bookshelf ↗
- Government sourceThe Agency for Toxic Substances and Disease Registry says the National Academies estimated that 98 percent of people in 2017 to 2018 survey data had PFAS levels of at least 2 ng/mL and 9 percent at least 20 ng/mL. ATSDR, CDC ↗
- Government sourceThe agency says a PFAS blood test will not identify a current or future health problem or provide information on treatment, and is most useful as part of a scientific investigation or health study. ATSDR, CDC ↗
- Government sourceThe agency says PFAS blood levels do not predict future health outcomes, and that results show how much of certain PFAS are in the blood without giving clear information about possible health effects. ATSDR, CDC ↗
Sources checked September 15, 2026. A brand statement is the company’s own claim, which we report but have not verified. Our grades are model-based estimates, not lab tests.