Thanatology: initial plateau of body cooling: 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: initial plateau of body cooling

Sample item

In a healthy adult found soon after death, the rectal temperature is almost unchanged for the first hour or two, then falls steadily. What best explains this early plateau?

AThe skin temperature falls to ambient immediatelyBBlood continues to circulate for an hour after deathCRigor mortis in the trunk muscles generates heatDA thermal gradient must first develop between the core and the skin

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

The answer and the reasoning

D. A thermal gradient must first develop between the core and the skin

Body cooling follows a sigmoid curve. Deep tissues are insulated by the surrounding mass, so the core stays warm until a temperature gradient has built up from the core to the skin, after which the fall is near linear and finally slows as it approaches the ambient temperature. This is why a single early temperature must be interpreted cautiously.

Option by option

A. The skin temperature falls to ambient immediately
The skin cools gradually, not instantly, and the plateau concerns the core.
B. Blood continues to circulate for an hour after death
Circulation stops at death, so blood cannot carry heat afterwards.
C. Rigor mortis in the trunk muscles generates heat
Rigor mortis follows ATP loss and does not generate meaningful heat.
D. A thermal gradient must first develop between the core and the skin (correct)
Correct. The core only starts to cool once the thermal gradient is established through the body mass.

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 D, A thermal gradient must first develop between the core and the skin. Body cooling follows a sigmoid curve.

Why is "The skin temperature falls to ambient immediately" not the answer?

The skin cools gradually, not instantly, and the plateau concerns the core.

Why is "Blood continues to circulate for an hour after death" not the answer?

Circulation stops at death, so blood cannot carry heat afterwards.

Why is "Rigor mortis in the trunk muscles generates heat" not the answer?

Rigor mortis follows ATP loss and does not generate meaningful heat.

What concept does this question test?

It tests Thanatology: initial plateau of body cooling in Forensic Medicine. Deep tissues are insulated by the surrounding mass, so the core stays warm until a temperature gradient has built up from the core to the skin, after which the fall is near linear and finally slows as it approaches the ambient temperature. This is why a single early temperature must be interpreted cautiously.

How hard is this question?

We tag it as a multi-step question: it asks you to combine more than one idea. 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: initial plateau of body cooling?

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.