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Open Resources for Nursing (Open RN); Ernstmeyer K, Christman E, editors. Nursing Fundamentals [Internet]. Eau Claire (WI): Chippewa Valley Technical College; 2021.

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Nursing Fundamentals [Internet].

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Table 15.6b

Lab Values Associated with Fluid and Electrolyte Imbalances

Lab ValueNormal Ranges
Serum osmolarity275 to 295 mmol/kg
Urine Specific Gravity1.010 and 1.020
HematocritMen: 42 to 52%
Women: 37 to 47%
BUN7 to 20 mg/dL
Serum sodium135-145 mEq/L
Serum potassium3.5-5 mEq/L
Serum magnesium1.5-2.4 mEq/L
Serum calcium8.5-10.3 mg/dL
Serum phosphorus2.5-4 mg/dL
ABGpH: 7.35 and 7.45
PaO2: 80-100 mm Hg
HCO3: 22-26 mEq/L
PaO2: 35-45 mm Hg

From: Chapter 15 Fluids and Electrolytes

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