Which laboratory parameter has a normal range of 135-145 mEq/L?

Which laboratory parameter has a normal range of 135-145 mEq/L?

• A. Potassium
• B. Chloride
• C. Sodium
• D. Albumin

Answer: (C)

Understanding normal electrolyte ranges helps you identify which parameter matches a given value range. Sodium is the primary extracellular cation and its serum level normally sits between 135 and 145 mEq/L. Values outside this window indicate hyponatremia or hypernatremia and can affect fluid balance and nerve/muscle function. The other choices use different normal ranges and units: potassium is typically 3.5–5.0 mEq/L, chloride about 98–106 mEq/L, and albumin is measured in g/dL, not mEq/L. So the 135–145 mEq/L range points to sodium.

Understanding normal electrolyte ranges helps you identify which parameter matches a given value range. Sodium is the primary extracellular cation and its serum level normally sits between 135 and 145 mEq/L. Values outside this window indicate hyponatremia or hypernatremia and can affect fluid balance and nerve/muscle function. The other choices use different normal ranges and units: potassium is typically 3.5–5.0 mEq/L, chloride about 98–106 mEq/L, and albumin is measured in g/dL, not mEq/L. So the 135–145 mEq/L range points to sodium.