A 28-year-old woman presents to the forensic medicine clinic 48 hours after an alleged assault. She has multiple lacerations on her forearms and face. The examining physician documents the wounds and wishes to determine the precise age of the lacerations to establish a timeline consistent with her account. Which investigation is most appropriate to estimate the age of the lacerations?

Explanation

## Investigation of Choice for Dating Lacerations **Key Point:** Histopathological examination of wound margins is the most reliable and widely accepted method for estimating the age of lacerations in forensic medicine. Microscopic changes in wound margins follow a predictable timeline. ### Histopathological Changes in Lacerations Over Time | Time Since Injury | Histopathological Findings | | --- | --- | | 0–6 hours | Minimal changes; intact epidermis at margins; minimal hemorrhage | | 6–12 hours | Inflammatory cell infiltration begins; fibrin deposition; tissue edema | | 12–24 hours | Acute inflammatory response; neutrophil infiltration; early granulation tissue | | 24–48 hours | Fibroblast proliferation; collagen deposition; reduced neutrophil count | | 48–72 hours | Increased fibroblast activity; neovascularization; granulation tissue formation | | > 72 hours | Epithelialization; collagen remodeling; scar formation | **High-Yield:** The key microscopic markers for dating wounds are: 1. **Fibrin deposition** — appears within 6–12 hours 2. **Neutrophil infiltration** — peaks at 12–24 hours 3. **Fibroblast proliferation** — prominent at 24–48 hours 4. **Collagen deposition** — increases after 48 hours 5. **Epithelialization** — begins after 72 hours ### Why Histopathology is Superior Histopathological examination provides: - Quantifiable cellular and tissue changes - Reproducible findings across different observers - Ability to assess multiple markers simultaneously - Established reference standards in forensic literature - Acceptance in court proceedings **Clinical Pearl:** The accuracy of wound dating is best within the first 72 hours. Beyond this period, the timeline becomes increasingly uncertain because healing rates vary with age, nutritional status, infection, and wound care. **Mnemonic: FINE** — **F**ibrin (6–12 hrs), **I**nflammation (12–24 hrs), **N**eovascularization (24–48 hrs), **E**pithelialization (> 72 hrs). **Warning:** Wound dating is not an exact science. Environmental factors (temperature, humidity), individual healing capacity, and infection can alter the timeline. Histopathology provides an estimate, not a precise age.