What is the normal serum magnesium value range?

What is the normal serum magnesium value range?

• A. 0.5-1.0 mg/dL
• B. 2.0-3.0 mg/dL
• C. 1.0-1.5 mg/dL
• D. 1.5-2.5 mg/dL

Answer: (D)

Normal serum magnesium is 1.5 to 2.5 mg/dL. This range is used clinically because it supports essential functions like nerve conduction, muscle contraction, and cardiac rhythm. Although total body magnesium is mostly inside cells and bones, serum levels are the standard measure of adequacy. Values below 1.5 mg/dL indicate hypomagnesemia, which can cause neuromuscular irritability and arrhythmias; values above 2.5 mg/dL indicate hypermagnesemia, which can depress reflexes and cardiac function, especially in those with kidney impairment. Some labs report the equivalent range as about 0.65–1.05 mmol/L.

Normal serum magnesium is 1.5 to 2.5 mg/dL. This range is used clinically because it supports essential functions like nerve conduction, muscle contraction, and cardiac rhythm. Although total body magnesium is mostly inside cells and bones, serum levels are the standard measure of adequacy. Values below 1.5 mg/dL indicate hypomagnesemia, which can cause neuromuscular irritability and arrhythmias; values above 2.5 mg/dL indicate hypermagnesemia, which can depress reflexes and cardiac function, especially in those with kidney impairment. Some labs report the equivalent range as about 0.65–1.05 mmol/L.