Epidemiology: lot quality assurance sampling: practice question

A PSM 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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PSM · Epidemiology: lot quality assurance sampling

Sample item

Lot Quality Assurance Sampling (LQAS) is commonly used in public health to:

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

The answer and the reasoning

D. Classify small areas as acceptable or not using small samples, such as immunisation coverage

LQAS draws a small sample (often 19 per lot) from each lot and compares the number of failures with a decision threshold. It is used for rapid monitoring of programme coverage in supervision areas.

Option by option

  • A. Estimate national prevalence with narrow confidence intervals

    National prevalence estimation needs large probability samples.

  • B. Randomise participants in a trial

    Randomisation in trials is a different procedure.

  • C. Standardise death rates

    Standardisation of rates is a demographic technique.

  • D. Classify small areas as acceptable or not using small samples, such as immunisation coverage (correct)

    Correct. LQAS classifies lots against a threshold with small samples.

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 PSM question

What is the answer to this PSM question?

The best answer is D, Classify small areas as acceptable or not using small samples, such as immunisation coverage. LQAS draws a small sample (often 19 per lot) from each lot and compares the number of failures with a decision threshold.

Why is "Estimate national prevalence with narrow confidence intervals" not the answer?

National prevalence estimation needs large probability samples.

Why is "Randomise participants in a trial" not the answer?

Randomisation in trials is a different procedure.

Why is "Standardise death rates" not the answer?

Standardisation of rates is a demographic technique.

What concept does this question test?

It tests Epidemiology: lot quality assurance sampling in PSM. It is used for rapid monitoring of programme coverage in supervision areas.

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 Epidemiology: lot quality assurance sampling?

Practise biostatistics with small calculations until sensitivity, predictive values and risk measures are automatic. Then use the flashcards and the other PSM 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.