Monitoring: practice question

A Anaesthesia 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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Anaesthesia · Monitoring

Sample item

What does pulse oximetry measure?

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

The answer and the reasoning

A. Estimated arterial oxygen saturation

Pulse oximetry estimates haemoglobin oxygen saturation from light absorption but does not directly measure ventilation or carbon dioxide retention.

Option by option

  • A. Estimated arterial oxygen saturation (correct)

    Correct: it estimates oxygen saturation.

  • B. Tidal volume directly

    Tidal volume needs ventilator measurement.

  • C. Arterial carbon dioxide directly

    CO2 needs capnography or blood gas.

  • D. Depth of neuromuscular block

    Block needs peripheral nerve assessment.

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.

More Anaesthesia questions

Questions about this Anaesthesia question

What is the answer to this Anaesthesia question?

The best answer is A, Estimated arterial oxygen saturation. Pulse oximetry estimates haemoglobin oxygen saturation from light absorption but does not directly measure ventilation or carbon dioxide retention.

Why is "Tidal volume directly" not the answer?

Tidal volume needs ventilator measurement.

Why is "Arterial carbon dioxide directly" not the answer?

CO2 needs capnography or blood gas.

Why is "Depth of neuromuscular block" not the answer?

Block needs peripheral nerve assessment.

What concept does this question test?

It tests Monitoring in Anaesthesia. The correct option holds because: Correct: it estimates oxygen saturation.

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 Monitoring?

Make a table of each agent, its key advantage and its main side effect. Then use the flashcards and the other Anaesthesia 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.