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biochemistryHas Critical Values

Sodium

Na⁺· also: Na⁺, Sodium

Clinical Overview

Sodium is the primary extracellular electrolyte controlling fluid balance. Abnormal sodium causes neurological symptoms. Critical for cardiac and brain function.

Reference RangesWHO/IFCC standards

Reference RangeUnitNotes
136 – 145mEq/L

Also reported in: mmol/L.

Critical (Panic) Values

Critical Low: < 120 mEq/L. Critical High: > 160 mEq/L. Values outside these limits require immediate clinical attention.

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Related Topics

electrolyteshyponatremiahypernatremiafluid balance

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