Table 2.
Comparison of concentrations measured in NHANES to estimated limit of quantitation (LOQ) to determine suitability of DBS measurements. BG is background contamination in cards.
| Compound | LOQ (ng/L) |
BG Contam. (ng/L) |
NHANES Concentration |
Ratio to LOQ |
Overall suitability for DBS measurements / BG Notes, if any |
||||
|---|---|---|---|---|---|---|---|---|---|
| 50th (ng/kg) |
90th (ng/kg) |
95th (ng/kg) |
50th (ratio) |
90th (ratio) |
95th (ratio) |
||||
| PCB-28 | 100 | 0 | 30 | 57 | 67 | 0.3 | 0.6 | 0.7 | Poor |
| PCB-138 | 33 | 0 | 95 | 359 | 477 | 2.9 | 10.8 | 14.3 | Excellent |
| PCB-153 | 33 | 0 | 135 | 477 | 624 | 4.1 | 14.3 | 18.7 | Excellent |
| PCB-180 | 57 | 35 | 114 | 409 | 534 | 2.0 | 7.2 | 9.4 | Excellent, BG Correction |
| PCB-105 | 17 | 17 | 7 | 27 | 43 | 0.4 | 1.6 | 2.5 | Good, BG Correction |
| PCB-118 | 100 | ND | 32 | 143 | 216 | 0.3 | 1.4 | 2.2 | Good |
| PCB-194 | 40 | 24 | 26 | 96 | 129 | 0.7 | 2.4 | 3.2 | Good, BG Correction |
| PCB-206 | 83 | ND | NA | NA | NA | NA | NA | NA | - |
| PCB-209 | 167 | ND | NA | NA | NA | NA | NA | NA | - |
| PCB-170 | 100 | ND | 41 | 144 | 188 | 0.4 | 1.4 | 1.9 | Good |
| PCB-187 | 100 | ND | 29 | 115 | 167 | 0.3 | 1.2 | 1.7 | Good |
| p,p'-DDE | 300 | ND | 1,260 | 7,070 | 12,100 | 4.2 | 23.6 | 40.3 | Excellent |
| β-HCH | 200 | ND | NA | 216 | 372 | NA | 1.1 | 1.9 | Good |
| HCB | 183 | ND | 90 | 157 | 186 | 0.5 | 0.9 | 1.0 | Fair |
| PBB-153 | 50 | ND | 14 | 84 | 178 | 0.3 | 1.7 | 3.6 | Good |
| TBBP-a | 40 | ND | NA | NA | NA | NA | NA | NA | - |
| BDE-28 | 100 | ND | NA | NA | NA | NA | NA | NA | - |
| BDE-47 | 100 | 35 | 126 | 558 | 1,068 | 1.3 | 5.6 | 10.7 | Excellent, BG Correction |
| BDE-99 | 100 | ND | NA | 142 | 277 | NA | 1.4 | 2.8 | Excellent |
| BDE-100 | 100 | ND | 24 | 121 | 239 | 0.2 | 1.2 | 2.4 | Good |
| BDE-153 | 50 | ND | 31 | 214 | 431 | 0.6 | 4.3 | 8.6 | Good |
| BDE-154 | 50 | ND | NA | 14 | 28 | NA | 0.3 | 0.6 | Poor |
(1) NA: not reported in NHANES.