Master Forensic Medicine
for FMGE

What the FMGE Tests in Forensic Medicine

The FMGE in Forensic Medicine tests the candidate's ability to apply medicolegal principles to clinical and autopsy scenarios. This includes the differentiation of antemortem from postmortem injuries, interpretation of fatal and non-fatal wounds, estimation of time since death using algor mortis, rigor mortis, and livor mortis, and knowledge of specific postmortem changes like adipocere and mummification. Candidates must know the legal definitions and management of sexual offences, including the examination protocol for alleged rape victims (consent, sample collection, chain of custody). Toxicology questions focus on identifying common poisons (organophosphates, cyanide, barbiturates, alcohol) by their clinical syndromes, antidotes (atropine, pralidoxime, naloxone, sodium nitrite), and autopsy findings (cherry-red lividity in cyanide, gastric mucosal erosion in corrosives). Medico-legal aspects of death certification, dowry death, and the Prohibition of Child Marriage Act are also tested. The exam expects recall of specific cut-off values (e.g., blood alcohol concentration for intoxication in India: 30 mg/100ml) and landmark legal cases.

High-Yield Concepts

• Time Since Death Estimation: Algor mortis: body temperature falls at ~0.8°C/hour in first 12 hours, then 0.5°C/hour. Rigor mortis: onset 1-2 hours after death, fully established by 6-12 hours, disappears after 24-36 hours. Livor mortis: fixed after 8-12 hours. Gastric emptying: last meal digested in 2-3 hours. Use these in combination to narrow window.
• Asphyxial Deaths: Hanging: ligature mark non-continuous, above thyroid cartilage, oblique. Strangulation: ligature mark horizontal, complete, below thyroid. Drowning: frothy fluid in airways, diatom test positive in bone marrow (if freshwater). Petechiae in eyes/face indicate venous congestion (e.g., traumatic asphyxia).
• Sexual Offence Examination: In alleged rape, collect vaginal/anal swabs, pubic hair, and clothing within 96 hours. Use rape kit, note injuries (hymenal tears, bruising). Blood for serology (HIV, HBsAg, VDRL). Urine for pregnancy test. Consent mandatory. Age estimation via ossification test (e.g., iliac crest fusion at 17-18 years).
• Common Poisons and Antidotes: Organophosphates: miosis, excessive secretions, bradycardia; treat with atropine (2 mg IV) and pralidoxime (1-2 g IV). Cyanide: bitter almond smell, cherry-red lividity; antidote: sodium nitrite (10 mL of 3% solution) then sodium thiosulfate (50 mL of 25%). Barbiturates: respiratory depression, pin-point pupils; antidote: naloxone (0.4-2 mg IV) but primarily supportive care.
• Dowry Death (Section 304B IPC): Death of a woman within 7 years of marriage by burns or bodily injury, with cruelty/harassment for dowry soon before death. Presumption of dowry death if proven. Autopsy must document all injuries, signs of struggle, and visceral analysis for poison (e.g., organophosphates or aluminium phosphide).
• Medicolegal Autopsy Procedure: External exam: note clothing, injuries, natural disease (e.g., rigor, lividity). Internal: Y-shaped incision, examine all cavities. Collect blood (for alcohol/poison), urine, stomach contents, vitreous humor (for electrolytes). Preserve viscera in saturated saline (for poison) or formalin (for histology). Chain of custody mandatory.
• Infanticide vs Stillbirth: Hydrostatic test: lungs of live-born float in water (due to air), stillborn lungs sink. Also, docimasia test: lung weight and volume. Maceration (skin peeling, skull collapse) indicates intrauterine death. Look for ligature marks, smothering, or head injuries in suspected infanticide.
• Alcohol Intoxication and Death: Blood alcohol concentration (BAC) >30 mg/100ml is legally intoxicated for driving in India. Fatal BAC >300 mg/100ml (chronic) or >150 mg/100ml (acute). Autopsy: smell of alcohol, congested brain, pulmonary edema. Postmortem blood alcohol may rise due to putrefaction; use vitreous humor for accurate measure.

Common Traps in Forensic Medicine Questions

• Confusing antemortem burns (blisters with red base, vital reaction) with postmortem burns (blisters without red base, no vital reaction).
• Assuming rigor mortis starts immediately after death; it begins in smaller muscles (jaw, eyelids) first, not in large muscles.
• Mixing up organophosphate (miosis, bradycardia) and carbamate poisoning (similar but shorter duration, no delayed neuropathy).
• Forgetting that in drowning, diatoms are only diagnostic if found in multiple organs (e.g., bone marrow, liver) and not just in lungs.
• Thinking that a ligature mark always indicates hanging; must check continuity and position relative to thyroid cartilage.
• Believing that all deaths from poisoning require a full toxicology screen; some poisons (e.g., cyanide) have characteristic autopsy findings without screen.

How to Revise Forensic Medicine for the FMGE

For FMGE Forensic Medicine, prioritise high-yield topics: time since death estimation (calculations), asphyxial deaths (hanging vs strangulation), sexual offence examination protocols, and common poisons with antidotes. Questions are often scenario-based, requiring you to identify the cause and mechanism (e.g., a woman found with cherry-red lividity and bitter almond smell → cyanide). Memorise key cut-off values (BAC, time for rigor mortis) and legal definitions (dowry death, infanticide). Practice interpreting autopsy findings from brief descriptions. Focus on Indian-specific laws (IPC sections, Prohibition of Child Marriage Act) and avoid overstudying rare poisons. Use mnemonics for antidotes and postmortem changes. Revise from standard textbooks (e.g., K.S. Narayan Reddy) and solve previous FMGE questions to spot recurring patterns.

Practise it: MedLumen has 50 Forensic Medicine questions for the FMGE, each with a full explanation and references.