What are the normal ranges for serum electrolytes?

Key normal serum electrolyte ranges are sodium 136 to 145 milliequivalents per liter, potassium 3.5 to 5.0, chloride 98 to 106, bicarbonate 22 to 26, calcium 8.5 to 10.5 milligrams per deciliter, magnesium 1.5 to 2.5, and phosphorus 2.5 to 4.5 milligrams per deciliter. These values are frequently tested on the NCLEX. Calcium and phosphorus have an inverse relationship. Magnesium and potassium often move together, so hypomagnesemia makes hypokalemia difficult to correct. Electrolyte imbalances affect neuromuscular function, cardiac rhythm, and mental status.