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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How much phosphorus is normally found in the serum?

1.0-3.0
2.5-4.5
3.0-5.0
2.0-4.0

The correct answer is: 2.5-4.5

The correct range for phosphorus levels in serum is typically between 2.5 to 4.5 mg/dL. This value represents the normal physiological range for phosphorus, an essential mineral that plays a crucial role in several bodily functions, including energy production, bone mineralization, and cellular signaling. Within this range, phosphorus supports various metabolic processes, including the formation of ATP (adenosine triphosphate), DNA, and RNA. Levels significantly outside of this range can indicate pathological conditions, such as hyperphosphatemia, often seen in kidney disease, or hypophosphatemia, which can occur from various metabolic disorders or malnutrition. The other options do not accurately reflect the typical reference range found in clinical practice for serum phosphorus and may lead to misunderstandings in diagnosing and managing conditions related to phosphorus imbalances. Understanding the normal range is essential for effective assessment and intervention in clinical settings.