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<section begin="clinical biochemistry" />'''Sodium''' is an abundant electrolyte in the body, and sodium ion (Na+) is the dominant ion in the extracellular space. 65% of sodium is in the extracellular space. Abnormally low or high sodium ([[hyponatraemia]] and [[hypernatraemia]], respectively), are common but potentially lethal disorders in the worst case.<section end="clinical biochemistry" />
<section begin="clinical biochemistry" />'''Sodium''' is an abundant electrolyte in the body, and sodium ion (Na+) is the dominant ion in the extracellular space. 65% of sodium is in the extracellular space. The main clinical function of sodium is to maintain osmolality.
 
Abnormally low or high sodium ([[hyponatraemia]] and [[hypernatraemia]], respectively), are common but potentially lethal disorders in the worst case.<section end="clinical biochemistry" />
<section begin="clinical biochemistry" />
<section begin="clinical biochemistry" />


{{Infobox medical condition
== Reference ranges ==
| name = Reference ranges
{| class="wikitable"
| definition = f
!'''Parameter'''
| sodium =
!'''Sample'''
| Sodium = 136 - 146 mmol/L
!'''Reference range'''
| Urine osmolality = 275 – 305 mOsmol/kg
|-
| Serum osmolality = 275 – 305 mOsmol/kg
|Sodium
}}
|Serum
|136 – 146 mM
|-
|Osmolality
|Serum
|275 – 305 mOsmol/kg
|-
|Osmolality
|Urine
|50 – 1400 mOsmol/kg
|}


== Sodium in the body ==
== Sodium in the body ==