A 32-year-old male is found dead in his locked apartment in Delhi during summer. The body is discovered 72 hours after being reported missing. On external examination, the skin shows a greenish discoloration over the right lower abdomen, and there is visible blistering of the skin with partial separation of the epidermis. The ambient temperature has been 38°C. What is the most appropriate next step in the medico-legal investigation?

Explanation

## Clinical Context The body shows classical signs of early putrefaction (greenish discoloration, blistering, skin slippage) at 72 hours in warm ambient temperature. The medico-legal priority is accurate estimation of the post-mortem interval (PMI). ## Key Point: **Estimation of time since death is a critical medico-legal function.** The stage of putrefaction must be correlated with environmental factors (temperature, humidity, clothing, body position, access to insects) to establish a reliable PMI range. **High-Yield:** In warm climates (>35°C), putrefaction progresses 2–3 times faster than in temperate zones. At 38°C ambient, the observed changes (greenish discoloration, blistering) typically appear 48–72 hours post-mortem, which aligns with the timeline here. ## Medico-Legal Algorithm ```mermaid flowchart TD A[Body discovered with putrefactive changes]:::outcome --> B{Document scene conditions}:::decision B -->|Temperature, humidity, insect activity| C[Stage of putrefaction identified]:::action C --> D[Correlate with PMI nomograms]:::action D --> E[Estimate time since death range]:::outcome E --> F[Proceed to autopsy with PMI context]:::action ``` ## Why This Approach 1. **Ambient temperature (38°C) accelerates decomposition** — greenish discoloration and blistering occur much earlier in hot climates than in temperate zones. 2. **Documentation of environmental conditions** (temperature, humidity, body covering, insect access) is essential for PMI calculation. 3. **Putrefaction staging** is one of the most reliable external markers for estimating PMI in the 24–96 hour window. 4. **Autopsy should follow, not precede, scene documentation** — internal changes are secondary to external timeline estimation. ## Common Pitfall ~~Delaying autopsy to allow "more putrefaction" — this destroys evidence and makes PMI estimation less reliable, not more.~~ **Clinical Pearl:** The Henssge nomogram and other PMI calculators use the formula: **PMI = (accumulated degree-days) / (sum of daily mean temperatures above 0°C)**. Accurate environmental data collection at the scene is non-negotiable.