Sodium (Na⁺)

🇺🇸 US Reference Range

136–146 mEq/L

Source: NBME

🇪🇺 EU Reference Range (SI Units)

136–146 mmol/L

Source: NBME

Mayo Clinic Reference Range

135–145 mmol/L

Source: Mayo Clinic

Note: Reference range for patients ≥1 year. <1 year: not established

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