Forensic and pathological examination · BEGINNER LESSON
Post-mortem
A post-mortem is an examination carried out after death to determine the cause and manner of death, and to assess disease and injury. In broader postmortem diagnostics, it can also include imaging, microbiology, biochemistry, toxicology, and genetics.
What it is and what is measured
In medicine, a post-mortem refers to examining a dead body to determine why death happened and how it happened. In the broader framework called postmortem diagnostics (PMD), the goal is also to assess the presence and extent of diseases and injuries. The main things measured or documented are visible body findings, tissue changes, and sometimes results from imaging, microbiology, biochemistry, toxicology, or genetic testing.
[1] pmc.ncbi.nlm.nih.gov › articles › PMC13331899Postmortem diagnostics - PMC [2] Why it is nonsensical to use retrospective power analyses to ... [3] Evaluation of Postmortem Changes - StatPearls - NCBI Bookshelf
How it works
A diagnostic autopsy is the core examination within PMD and centers on macroscopic examination, meaning what can be seen with the naked eye, and histopathology, meaning study of tissues under a microscope. Postmortem examination may also use postmortem imaging, structured interviews with relatives in a verbal autopsy, and laboratory tests. After death, the body also undergoes postmortem changes: early changes include cooling of the body (algor mortis), settling of blood in low areas (livor mortis), and muscle stiffening (rigor mortis). Later, decomposition begins through autolysis, where cell enzymes leak and break down cells, and putrefaction, where microbes spread and degrade tissue.
[1] pmc.ncbi.nlm.nih.gov › articles › PMC13331899Postmortem diagnostics - PMC [3] Evaluation of Postmortem Changes - StatPearls - NCBI Bookshelf
Limitations and boundaries
Postmortem findings do not stay constant: the speed of changes depends on factors such as temperature, clothing, body fat, infection, wounds, and storage conditions. Because of this, estimates of postmortem interval, or PMI, meaning time since death, are only general guidelines and are not fixed values. A further limit is that PMD is meant for diagnostic work; research autopsies done only to collect tissue for research are a different category with separate legal and ethical rules. In statistics, the word postmortem can also be used loosely for a review after a study ends, but that is not the same as examining a body.
[1] pmc.ncbi.nlm.nih.gov › articles › PMC13331899Postmortem diagnostics - PMC [2] Why it is nonsensical to use retrospective power analyses to ... [3] Evaluation of Postmortem Changes - StatPearls - NCBI Bookshelf
SEE THE IDEA
From death to postmortem findings
Body functions stop and postmortem changes begin.
Cooling, blood settling, and muscle stiffening appear first.
Autolysis and putrefaction break down tissues.
Autopsy, imaging, and laboratory tests help determine cause and manner of death.
Sequential process: bodily changes start after death, and postmortem diagnostics documents them to explain death.
Postmortem diagnostics uses the body’s changing condition and test results to reconstruct what happened after death.
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Sources and further reading
This general lesson was generated from public source material. It explains a concept; it does not interpret a private paper or provide medical advice.