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Modified from Guy and Maibach (Bronaugh et al., 1985). Penetration indices for five anatomical sites (genitals, arms, legs, trunk, head) with relation to surface areas. Used when considering systemic availability relativity to body exposure areas.
| Adults | Area (cm2) | Neonates | Area (cm2) | |
|---|---|---|---|---|
| Anatomical Region | Body area (%) | Body area (%) | ||
| Genitals | 1 | 190 | 1 | 19 |
| Arms | 18 | 3,420 | 19 | 365 |
| Legs | 36 | 6,840 | 30 | 576 |
| Trunk | 36 | 6,840 | 31 | 595 |
| Head | 9 | 1,710 | 19 | 365 |
| Total | 19,000 | 1,920 |
