TABLE. Comparison of serum concentrations of per- and polyfluoroalkyl substances (PFAS) in the U.S. population with concentrations among participants (N = 30) residing near a PFAS manufacturing facility where PFAS were detected — North Carolina, 2018.

PFAS	Abbreviation	Limit of detection (LOD)	Serum concentrations (μg/L)
			Participants (N = 30)			U.S. population*
			Median	Minimum	Maximum	Median	95th percentile
2,3,3,3,-tetrafluoro-2-(1,1,2,2,3,3,3-heptafluoropropoxy)-propanoate	GenX	0.1	—†	—	—	Not measured
perfluorobutane sulfonic acid	PFBS	0.1	—	—	—	—	—
perfluorohexanoic acid	PFHxA	0.1	—	—	—	Not measured
perfluorobutanoic acid	PFBA	0.1	—	—	—	Not measured
perfluoroheptanoic acid	PFHpA	0.1	—	—	0.6	—	0.2
perfluoropentanoic acid	PFPeA	0.1	—	—	—	Not measured
4,8-dioxa-3H-perfluorononanoat	ADONA	0.1	—	—	—	Not measured
9-chlorohexadecafluoro-3-oxanonane-1-sulfonate	9Cl-PF3ONS	0.1	—	—	—	Not measured
2-(N-methyl-perfluorooctane sulfonamido) acetic acid	MeFOSAA	0.1	—	—	0.6	—	0.6
perfluorohexane sulfonic acid	PFHxS	0.1	2.1	0.7	6.7	1.2	4.9
linear perfluorooctanoic acid	n-PFOA	0.1	1.8	0.4	7.3	1.5	4.1
branched perfluorooctanoic acids	Sb-PFOA	0.1	—	—	—	—	—
perfluorodecanoic acid	PFDA	0.1	0.2	—	1.3	0.1	0.7
perfluoroundecanoic acid	PFUnDA	0.1	—	—	0.5	—	0.4
perfluoromethylheptane sulfonic acids (methyl branched PFOS)	Sm-PFOS	0.1	1.2	0.2	7.4	1.5	5.7
linear perfluorooctane sulfonic acid	n-PFOS	0.1	5.5	1.4	34.6	3.2	12.8
perfluorononanoic acid	PFNA	0.1	0.6	—	2.1	0.6	1.9

* CDC. Fourth national report on human exposure to environmental chemicals: updated tables, January 2019, volume one. Atlanta, GA: US Department of Health and Human Services, CDC; 2019. https://www.cdc.gov/exposurereport/pdf/FourthReport_UpdatedTables_Volume1_Jan2019-508.pdf.

^† Below the LOD (applies to all of the dashes in cells of the table).