American Association of Critical-Care Nurses (AACN) Certification Practice Test

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Prepare for the AACN Certification Test. Study with flashcards and multiple choice questions, each question comes with hints and explanations. Get ready for your exam!

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What is the standard blood urea nitrogen (BUN) range?

5-15
7-21
10-25
4-20

The correct answer is: 7-21

The standard blood urea nitrogen (BUN) range is typically considered to be 7-21 mg/dL. This range reflects normal kidney function and the body’s urea production. Urea is a waste product formed from the breakdown of proteins, and it is normally excreted by the kidneys. Therefore, measuring BUN levels can give valuable insight into kidney health and function. The normal range of 7-21 mg/dL is widely accepted and helps clinicians assess hydration status, kidney function, and to some extent, protein metabolism. BUN levels can be affected by various factors such as diet, hydration status, and underlying medical conditions, making it important to interpret these values in the context of the patient's overall clinical picture. Using this range as a benchmark aids healthcare professionals in identifying conditions that can lead to elevated or decreased BUN levels, guiding further diagnostic evaluations or interventions.