NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

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Prepare for the NAPLEX (North American Pharmacist Licensure Examination) Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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How is dehydration indicated in tests?

BUN:SCr < 20:1
BUN:SCr = 20:1
BUN:SCr > 20:1
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.