NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

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How is dehydration indicated in tests?

  1. BUN:SCr < 20:1

  2. BUN:SCr = 20:1

  3. BUN:SCr > 20:1

  4. BUN:SCr > 30:1

The correct answer is: BUN:SCr > 20:1

BUNSCr is a measurement of the ratio between blood urea nitrogen and serum creatinine, which can be used to determine kidney function. A ratio of 20:1 or higher can indicate dehydration because when the body is dehydrated, less fluid is available to be filtered by the kidneys, resulting in a higher concentration of both BUN and SCr in the blood. Option A and B are incorrect because they suggest a lower BUN:SCr ratio, which would not be indicative of dehydration. Option D is incorrect because it specifies a higher ratio of 30:1, which could indicate kidney disease or dysfunction rather than dehydration.

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