Do I have PFAS in my blood?

Almost certainly yes — biomonitoring finds detectable PFAS in over 95% of people tested in industrialised countries, and levels in remote populations confirm global distribution through water, food, dust and consumer products. The more useful question is whether your level is elevated: people who have drunk contaminated water, worked with fluorochemicals or firefighting foam, or eaten fish from contaminated waters can carry levels tens to hundreds of times background. For that group, US National Academies guidance supports blood testing and structured clinical follow-up; for the general population, testing adds little because results are near-universal and management would not change.

Does PFAS exposure cause cancer?

At the exposures documented in contaminated communities and occupational settings, the evidence supports it: IARC classified PFOA as carcinogenic to humans in 2023, with kidney and testicular cancer the best-supported sites, consistent with the C8 findings. At general-population background levels the answer is genuinely uncertain — any individual risk increase is too small to measure directly, which is different from being zero. PFAS are a demonstrated carcinogen at high exposure and an unquantified, probably small, cancer risk at background exposure; collapsing that distinction in either direction misleads.

Should I throw away my non-stick pans?

Intact PTFE cookware is a minor exposure route — the polymer itself is inert and poorly absorbed; the historical problem was PFOA used in manufacturing, phased out years ago. Overheated empty pans release fumes that harm pet birds and can cause transient flu-like symptoms in humans, so moderate heat and ventilation are sensible, and heavily scratched pans are reasonably replaced. But drinking water in contaminated areas, certain food packaging and house dust dominate real-world intake; the pan is the most visible and least important part of the exposure picture.

Is drinking water safe now?

It depends where you live, which is precisely the problem. Where utilities meet the new limits — 4 ng/L for PFOA and PFOS in the US, 100 ng/L for the sum of 20 PFAS under the EU Drinking Water Directive — tap water is a minimal contributor to body burden. Thousands of systems, particularly near airports, military bases and fluorochemical plants, exceed those levels and are on compliance timelines extending to 2031 in the US. If you are in a known contamination zone, a certified activated-carbon or reverse-osmosis filter is effective in the interim; utilities are required to publish PFAS monitoring results.

Were PFOA and PFOS bans pointless since PFAS are everywhere?

The opposite: they are among the clearest demonstrations that chemical regulation works. Serum PFOA and PFOS in Western populations have fallen steadily for two decades since production phase-outs — in many countries to well under half of peak levels. Persistence in the environment is permanent; persistence in people is not, because ongoing intake dominates blood levels for these compounds. The legitimate criticism is not that phase-outs failed but that they were replaced by structurally similar substitutes with less data — the regrettable-substitution problem that class-based regulation is designed to end.

What is a safe PFAS level in blood?

No threshold of demonstrated safety exists, so guidance is pragmatic. The US National Academies (2022) framework: below 2 ng/mL summed serum PFAS, no PFAS-specific follow-up; 2-20 ng/mL, standard care with attention to cholesterol, blood pressure in pregnancy and breast cancer screening per age; above 20 ng/mL, add thyroid testing and awareness of kidney and testicular cancer signs. These are risk-management bands, not lines between safe and poisoned — a distinction worth making explicitly with worried patients, whose serum level mostly reflects where they lived and cannot be quickly changed.

Home › Topics › PFAS ('Forever Chemicals')

PFAS ('Forever Chemicals')

GMJ News knowledge hub · last reviewed September 2026 · Georgian Medical Journal

Summary Statistics Glossary GMJ news FAQ Documents Organizations Research

Per- and polyfluoroalkyl substances (PFAS) — a family of more than 10,000 synthetic compounds prized for water, grease and heat resistance — are the rare chemical scare in which the core concerns are largely substantiated: they are extraordinarily persistent, detectable in the blood of nearly every human tested, and linked in consistent epidemiology to raised cholesterol, reduced vaccine antibody response in children and kidney and testicular cancer at higher exposures. IARC classified PFOA as carcinogenic to humans (Group 1) in 2023, and regulators on both sides of the Atlantic have imposed drinking-water limits measured in nanograms per litre. The genuinely open questions concern dose—response at background exposure levels, the thousands of newer compounds that replaced the two best-studied ones, and how a chemistry this useful and this persistent should be phased down (WHO Q&A on PFAS).

Key messages

SETTLED: extreme persistence and universal human exposure

The defining chemistry is not contested by anyone: the carbon-fluorine bond is among the strongest in organic chemistry, so PFAS do not meaningfully degrade in the environment, and the legacy compounds PFOA and PFOS have half-lives of years in human blood. Biomonitoring finds PFAS in the serum of essentially every person tested in industrialised countries, in remote Arctic populations and in wildlife globally. 'Forever chemicals' is, for once, accurate branding rather than hyperbole.

SETTLED: real health effects at documented exposures

The epidemiology is unusually strong for environmental chemistry because of a natural experiment: the C8 Health Project studied roughly 69,000 people exposed through contaminated water near a PFOA plant, and with the wider literature supports probable links to raised cholesterol, kidney and testicular cancer, thyroid disease, ulcerative colitis and pregnancy-induced hypertension. Separately, prospective birth cohorts show that higher childhood PFAS levels are associated with reduced antibody response to routine vaccines — the immunotoxicity finding that drives the strictest regulatory limits. IARC classified PFOA as Group 1 (carcinogenic to humans) and PFOS as Group 2B in 2023.

GENUINELY OPEN: how dangerous background-level exposure is

The honest uncertainty is dose-response at the bottom of the curve. Regulatory limits now sit near the limit of quantification — the US EPA set enforceable drinking-water maxima of 4 nanograms per litre for PFOA and PFOS in 2024 — reflecting a judgment that no safe threshold can be demonstrated for immunotoxicity, not a demonstration that background exposures cause measurable disease. Reasonable scientists disagree about how much population disease burden current general-population levels actually produce, and clinical significance of the vaccine-antibody effect at background exposure is unresolved.

GENUINELY OPEN: the other ten thousand compounds

PFOA and PFOS were phased out of Western production years ago and blood levels of both have been falling for two decades — a genuine regulatory success rarely acknowledged. They were replaced by shorter-chain and novel PFAS (GenX and others) with less toxicological data, faster excretion but similar persistence. Whether these substitutes are safer or merely newer is the central scientific question, and it fuels the policy argument between regulating PFAS one-by-one and regulating the entire class — the approach the EU is pursuing through a proposed universal restriction with essential-use exemptions.

CONTESTED POLICY: limits, costs and the 2025 retrenchment

The 2024 US limits were immediately challenged by water utilities on feasibility and cost grounds, and in 2025 the EPA kept the PFOA/PFOS limits while extending compliance deadlines to 2031 and moving to rescind limits on several other PFAS — a live illustration that the fight is now less about whether PFAS harm health than about who pays for removal, with national remediation costs estimated in the hundreds of billions. The polluter-pays litigation, with multibillion-dollar settlements by major manufacturers, is resolving part of that question in court.

What patients and clinicians can actually do

US clinical guidance (National Academies, 2022) supports blood PFAS testing for people with likely elevated exposure — contaminated water, firefighting, fluorochemical work — with tiered follow-up: above 20 ng/mL summed serum PFAS, screen for dyslipidaemia, thyroid function, kidney and testicular cancer signs. Exposure reduction is mostly a water question: certified activated carbon or reverse osmosis filtration works where water is contaminated. Diet-level avoidance beyond that has modest impact, since exposure is diffuse — which is precisely why the durable solution is upstream regulation rather than consumer vigilance.

Key statistics

10,000+

distinct PFAS compounds — of which only a handful have substantial human toxicology

OECD

~69,000

people in the C8 Health Project, the natural experiment underlying probable-link findings for PFOA

C8 Science Panel

Group 1

IARC classification of PFOA as carcinogenic to humans (2023); PFOS classified Group 2B

IARC

4 ng/L

US enforceable drinking-water maximum for PFOA and PFOS set in 2024 — compliance extended to 2031

US EPA

20 ng/mL

summed serum PFAS above which US National Academies guidance recommends enhanced clinical follow-up

NASEM 2022

Falling

blood PFOA and PFOS levels in Western populations for two decades after phase-out — regulation demonstrably works

Biomonitoring programmes

PFAS — where the disagreement actually lies

Source: Bars show strength of supporting evidence. High values indicate well-supported propositions; low values indicate claims tested and not supported.

Glossary of key terms

The carbon-fluorine bond and persistence
ChemistryPFAS are built on chains of carbon atoms saturated with fluorine. The carbon-fluorine bond is exceptionally strong and resistant to heat, light, oxidation and microbial attack — the property that makes PFAS superb in firefighting foam, non-stick coatings, waterproofing and semiconductor manufacture, and the same property that makes them effectively permanent in soil and groundwater. Unlike most organic pollutants there is no meaningful natural degradation pathway; destruction requires engineered processes such as high-temperature incineration or emerging supercritical water oxidation. Every kilogram produced is, on human timescales, a permanent addition to the biosphere.

The C8 Health Project
Evidence/HistoryThe settlement of litigation over PFOA ('C8') releases from a West Virginia fluoropolymer plant funded the largest study ever conducted of a chemically exposed community: about 69,000 residents gave blood and health data, and an independent science panel spent seven years determining which diseases showed a 'probable link' to exposure. The panel concluded: kidney cancer, testicular cancer, thyroid disease, ulcerative colitis, pregnancy-induced hypertension and diagnosed high cholesterol. The design — court-funded, independent, prospective, with measured serum levels — remains the model refutation of the claim that environmental epidemiology can never establish anything.

Immunotoxicity and the vaccine antibody findings
ToxicologyProspective cohorts, most prominently in the Faroe Islands where diet produces elevated exposure, found that children with higher serum PFAS mounted significantly lower antibody responses to tetanus and diphtheria vaccination — in some analyses a halving of antibody concentration per doubling of exposure. This endpoint, rather than cancer, drives the strictest modern limits: both the EFSA tolerable weekly intake (2020) and the near-zero US water maxima rest substantially on immune effects, on the logic that a functional immune deficit in children at low doses indicates no demonstrable safe threshold. The clinical significance — whether affected children actually suffer more infections — remains under study, and this is a genuine open question rather than settled harm.

Hazard, risk and the 4 ng/L logic
Regulatory scienceA limit of 4 nanograms per litre — parts per quadrillion territory, essentially the lowest concentration reliably measurable — is not a claim that 5 ng/L water injures people. It encodes three judgments: no demonstrable threshold for immunotoxicity, universal existing body burden leaving no margin, and irreversibility of further accumulation. Critics respond that limits at the quantification floor impose enormous compliance costs for undemonstrated marginal benefit. Both positions are coherent; the disagreement is about precaution under uncertainty and about who bears the cost, not about the underlying toxicology.

Class regulation and essential use
PolicyWith 10,000+ compounds and toxicology available for a few dozen, one-by-one regulation guarantees regrettable substitution — each restricted PFAS replaced by an untested cousin. The EU response is a proposed restriction of PFAS as an entire class under REACH, with time-limited exemptions for uses deemed essential and lacking alternatives (certain medical devices, semiconductors, green-energy hardware). Industry contests the class definition as chemically overbroad. The essential-use concept — permit a hazardous chemistry only where society genuinely needs it — is the most significant regulatory innovation to emerge from the PFAS problem and will likely outlive it.

Remediation: what actually removes PFAS
EngineeringGranular activated carbon and ion-exchange resins capture long-chain PFAS effectively but merely concentrate them, creating a spent-media disposal problem; reverse osmosis removes short chains too at higher cost and produces a concentrated reject stream. True destruction — breaking carbon-fluorine bonds — requires high-temperature incineration or developing technologies such as supercritical water oxidation and plasma treatment. At household scale, certified carbon-block or reverse-osmosis filters are effective where water is contaminated; boiling does nothing and bottled water is unregulated for PFAS in most jurisdictions.