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<section begin="clinical biochemistry" />'''Hyponatraemia''' is a disorder of [[sodium]] homeostasis characterised by low levels of sodium (< 135 or 136 mmol/L). It's the most common electrolyte abnormality, affecting 3-10% of patients in the emergency department. It's usually mild and is self-limiting, but severe hyponatraemia is lethal. Determining the volume status and serum osmolality of the patient is important in determining the cause. Treatment involves water restriction or sodium repletion. | <section begin="clinical biochemistry" />'''Hyponatraemia''' is a disorder of [[sodium]] homeostasis characterised by low levels of sodium (< 135 or 136 mmol/L). It's the most common electrolyte abnormality, affecting 3-10% of patients in the emergency department. It's usually mild and is self-limiting, but severe hyponatraemia is lethal. Determining the volume status and serum osmolality of the patient is important in determining the cause. Treatment involves water restriction or sodium repletion. The opposite of hyponatraemia is [[hypernatraemia]]. | ||
{{Infobox medical condition | {{Infobox medical condition |