| ALA | urinary δ-aminolevulinic acid |
| BMD | Benchmark dose |
| BMDLs | 95% lower confidence limit of the benchmark dose |
| CP | coproporphyrin |
| FEP | free erythrocyte protoporphyrin |
| OCELs | occupational cumulative exposure limits |
| PC-TWA | permissible concentration-time weighted average |
| T1/2 | half-life |
| TWA | time-weighted average |
| ZPP | erythrocyte zinc protoporphyrin |
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