NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

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How is the minimum weighable quantity (MWQ) calculated?

  1. sensitivity requirement * acceptable error rate

  2. sensitivity requirement / acceptable error rate

  3. acceptable error rate / sensitivity requirement

  4. (sensitivity requirement + acceptable error rate) / 2

The correct answer is: sensitivity requirement / acceptable error rate

The minimum weighable quantity is calculated by dividing the sensitivity requirement by the acceptable error rate, not by multiplying them together or averaging them. This is because the sensitivity requirement represents the smallest measurable weight, while the acceptable error rate represents the margin of error allowed in the measurement. Dividing the sensitivity requirement by the acceptable error rate gives us the minimum amount that can be measured accurately without exceeding the acceptable margin of error. Option A and D both involve multiplying the sensitivity requirement and acceptable error rate, while option C involves dividing in the opposite order and would result in a larger MWQ. Therefore, option B is the correct calculation for determining MWQ.

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