Sodium (Na)

Primary extracellular cation. Dysregulation affects neurologic function.

Units

mmol/L

Reference (Male)

136 – 145 mmol/L

Reference (Female)

136 – 145 mmol/L

What it measures

Primary extracellular cation. Dysregulation affects neurologic function.

What a high value can mean

Dehydration, diabetes insipidus, excess salt intake.

What a low value can mean

SIADH, heart failure, cirrhosis, thiazide diuretics, severe vomiting/diarrhea.

Conditions it helps assess

Water balance
Neurologic risk

Reading these numbers in context

Reference ranges describe the central 95 % of a healthy reference population — 5 % of perfectly healthy people fall outside any given range by definition. A single mildly abnormal value is rarely meaningful on its own. blood-test.life always interprets values together with related biomarkers before flagging.

Related biomarkers in Electrolytes

Potassium K Primary intracellular cation. Tight regulation is critical for cardiac rhythm. Calcium Ca Critical for nerve, muscle, bone, and clotting. Interpret with albumin or ionized calcium. Magnesium Mg Cofactor in 300+ enzymatic reactions. Commonly under-tested despite frequent subclinical deficiency.