Thanatology: purge fluid: practice question

A Forensic Medicine question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Forensic Medicine · Thanatology: purge fluid

Sample item

A bloated, greenish body is recovered from a pond after three days. Dark, foul-smelling, blood-stained fluid is running from the mouth and nostrils. No injuries are found on the body. What is the most likely explanation?

APurging of putrefactive fluid pushed out by gas pressureBHaemoptysis from a ruptured lung cavityCVomiting immediately before deathDBleeding from a fracture of the skull base

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

A. Purging of putrefactive fluid pushed out by gas pressure

Putrefactive gas raises the pressure in the thorax and abdomen and forces dark, altered, blood-stained fluid from the mouth and nose. It can be mistaken for antemortem haemorrhage or vomiting, but there is no injury, and the body shows other signs of decomposition.

Option by option

A. Purging of putrefactive fluid pushed out by gas pressure (correct)
Correct. Purge fluid is a postmortem decomposition artefact and does not indicate haemorrhage in life.
B. Haemoptysis from a ruptured lung cavity
Haemoptysis would need a diseased lung and fresh bright blood, with no putrefactive fluid.
C. Vomiting immediately before death
Vomit would contain gastric contents, not dark putrefied blood-stained fluid.
D. Bleeding from a fracture of the skull base
A basal skull fracture would be found at autopsy; no injuries were found.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

Questions about this Forensic Medicine question

What is the answer to this Forensic Medicine question?

The best answer is A, Purging of putrefactive fluid pushed out by gas pressure. Putrefactive gas raises the pressure in the thorax and abdomen and forces dark, altered, blood-stained fluid from the mouth and nose.

Why is "Haemoptysis from a ruptured lung cavity" not the answer?

Haemoptysis would need a diseased lung and fresh bright blood, with no putrefactive fluid.

Why is "Vomiting immediately before death" not the answer?

Vomit would contain gastric contents, not dark putrefied blood-stained fluid.

Why is "Bleeding from a fracture of the skull base" not the answer?

A basal skull fracture would be found at autopsy; no injuries were found.

What concept does this question test?

It tests Thanatology: purge fluid in Forensic Medicine. It can be mistaken for antemortem haemorrhage or vomiting, but there is no injury, and the body shows other signs of decomposition.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Thanatology: purge fluid?

Learn postmortem changes with their timelines, and toxicology as poison, sign, test and antidote. Then use the flashcards and the other Forensic Medicine questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.