At autopsy, which of the following is the most reliable early indicator of time since death when performed within the first 24 hours?
- A Degree of rigor mortis
- B Postmortem body temperature decline (algor mortis) ✓
- C Degree of putrefaction
- D Colour and extent of lividity
Correct answer: B. Postmortem body temperature decline (algor mortis)
Explanation
Algor mortis (postmortem cooling) measured with a rectal thermometer and calculated using the Henssge nomogram is the most reliable early indicator of time since death within the first 12-24 hours. The body cools at approximately 1-1.5°C per hour under standard conditions. Rigor mortis and lividity are less precise because they are affected by many variables including activity before death and ambient temperature.
Reference: The Essentials of Forensic Medicine and Toxicology (Narayan Reddy), 34th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.