AACN Certification Practice Test 2026 – Comprehensive Exam Prep

A normal phosphorus level in the human body typically falls within the range of 2.5 to 4.5 mg/dL. This range is important because phosphorus plays a critical role in various bodily functions, including energy storage and utilization, bone mineralization, and cellular function. Maintaining phosphorus within this normal range is vital for physiological processes such as ATP production, which is essential for energy transfer in cells.

When phosphorus levels fall outside of this range, it can lead to various health issues. For instance, low phosphorus levels (hypophosphatemia) may result in muscle weakness, bone pain, and impaired metabolism, while elevated levels (hyperphosphatemia) can cause mineral deposits in tissues and may be associated with kidney disease.

The other ranges provided do not accurately reflect the typical reference range for phosphorus levels in clinical settings and may lead to misinterpretation of a patient’s electrolytes if relied upon for diagnosis or treatment. Understanding these values is essential for monitoring and managing patient health effectively, particularly in critical care contexts where electrolyte imbalances may be common.