Airway devices: LMA sizing: 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 · Airway devices: LMA sizing

Sample item

Which LMA size is generally used for an average adult woman weighing 55 kg?

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

The answer and the reasoning

C. Size 4

LMA size 3 is for 30 to 50 kg, size 4 for 50 to 70 kg and size 5 for 70 to 100 kg. A 55 kg woman therefore needs size 4, though many use size 3 or 4 depending on build.

Option by option

  • A. Size 6

    Size 6 is for very large patients and exists only in some designs.

  • B. Size 3.5

    Size 3.5 does not exist in the standard LMA classic range.

  • C. Size 4 (correct)

    Correct. Size 4 covers 50 to 70 kg.

  • D. Size 2

    Size 2 is for children of about 10 to 20 kg.

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.

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Questions about this Anaesthesia question

What is the answer to this Anaesthesia question?

The best answer is C, Size 4. LMA size 3 is for 30 to 50 kg, size 4 for 50 to 70 kg and size 5 for 70 to 100 kg.

Why is "Size 6" not the answer?

Size 6 is for very large patients and exists only in some designs.

Why is "Size 3.5" not the answer?

Size 3.5 does not exist in the standard LMA classic range.

Why is "Size 2" not the answer?

Size 2 is for children of about 10 to 20 kg.

What concept does this question test?

It tests Airway devices: LMA sizing in Anaesthesia. A 55 kg woman therefore needs size 4, though many use size 3 or 4 depending on build.

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 Airway devices: LMA sizing?

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.