Table 2.
Perfluoroalkyl Substance | Abbreviated Name | % > LOQ | Chain Lengthb | Plasma Concentration (ng/mL) by Percentile |
|||||
---|---|---|---|---|---|---|---|---|---|
5th | 25th | 50th | 75th | 95th | CVc | ||||
Perfluorooctanoic acid | PFOA | 100.0 | 7 | 1.43 | 2.14 | 2.78 | 3.57 | 5.15 | 8.6 |
Perfluorononanoic acid | PFNA | 99.7 | 8 | 0.24 | 0.39 | 0.54 | 0.74 | 1.12 | 13.3 |
Perfluorodecanoic acid | PFDA | 71.1 | 9 | <LOQ | <LOQ | 0.10 | 0.18 | 0.34 | 27.0 |
Perfluoroundecanoic acid | PFUnDA | 83.7 | 10 | <LOQ | 0.08 | 0.17 | 0.27 | 0.47 | 22.2 |
Perfluorohexane sulfonate | PFHxS | 99.5 | 6 | 0.27 | 0.49 | 0.69 | 0.95 | 1.78 | 14.6 |
Perfluoroheptane sulfonate | PFHpS | 83.6 | 7 | <LOQ | 0.09 | 0.15 | 0.23 | 0.37 | 29.8 |
Perfluorooctane sulfonate | PFOS | 100.0 | 8 | 6.07 | 9.69 | 12.87 | 17.03 | 25.53 | 11.4 |
Abbreviations: CV, coefficient of variation; LOQ, limit of quantification.
a The 7 perfluoroalkyl substances were those with concentrations that could be quantitated in more than 50% of samples.
b Refers to the number of carbons in the fully-fluorinated alkyl chain.
c Interassay coefficient of variation was calculated as (standard deviation/mean) × 100 for 25 pooled samples.