What is the reference range for Sodium?

The standard reference range for Sodium is Approximately 136–145 mmol/L; assay-specific.. Reference ranges vary by laboratory and assay platform — interpret in context of the issuing laboratory's stated range.

Which tests measure Sodium?

Sodium is measured in 6 tests on BiomarkersLabs.com, including Basic Metabolic Panel, Basic Metabolic Panel without Calcium, Basic Metabolic Panel, Plasma.

Biomarker Reference · Na

What does the Sodium test measure?

Sodium (Na) is a clinical biomarker used in metabolic-diabetes assessment. Sodium is the principal extracellular cation, accounting for most of plasma osmolality and determining extracellular fluid volume. It is measured in 6 laboratory tests on BiomarkersLabs.com.

Reference Range: Approximately 136–145 mmol/L; assay-specific.
Units: mmol/L, mEq/L
Measured In: 6 tests
Category: Metabolic

Functional medicine optimalMost practitioners consider 138–142 mmol/L physiologically optimal, though healthy individuals tolerate a somewhat wider span without symptoms.

What is Sodium?

Sodium is the principal extracellular cation, accounting for most of plasma osmolality and determining extracellular fluid volume. Its concentration is tightly regulated by thirst, antidiuretic hormone, and renal sodium handling. Because water balance profoundly affects measured sodium concentration, dysnatraemia typically reflects disturbances in water homeostasis rather than total body sodium per se.

Why is Sodium measured?

Sodium is interpreted as part of the electrolyte and acid-base cluster rather than alone. Hyponatraemia is read with volume status and, where available, serum and urine osmolality to separate hypovolaemic, euvolaemic, and hypervolaemic causes; hypernatraemia signals a water deficit. The rate of change matters as much as the absolute value because of the risk of osmotic demyelination with over-rapid correction.

Reference ranges

Standard reference: Approximately 136–145 mmol/L; assay-specific.
Functional medicine optimal: Most practitioners consider 138–142 mmol/L physiologically optimal, though healthy individuals tolerate a somewhat wider span without symptoms.
Units: mmol/L, mEq/L

Reference ranges vary by laboratory and assay platform. Interpret in context of the issuing laboratory's stated range.

Tests that measure Sodium

6 tests on BiomarkersLabs.com include this biomarker.

BML-MET-015Comprehensive

Basic Metabolic Panel

Sodium reference range in this test: Approximately 135–145 mmol/L.

BML-MET-021Comprehensive

Basic Metabolic Panel without Calcium

Sodium reference range in this test: Approximately 136–145 mmol/L; assay-specific.

BML-MET-020Comprehensive

Basic Metabolic Panel, Plasma

Sodium reference range in this test: 135–145 mmol/L; assay-specific.

BML-MET-024Comprehensive

Comprehensive Metabolic Panel

Sodium reference range in this test: 136–145 mmol/L; narrow therapeutic window.

BML-MET-026Comprehensive

Comprehensive Metabolic Panel with Adjusted Calcium, Plasma

Sodium reference range in this test: 135–145 mmol/L, assay-specific.

BML-MET-025Comprehensive

Comprehensive Metabolic Panel, Plasma

Sodium reference range in this test: 136–145 mmol/L (laboratory-specific).

Related clinical conditions

Related Biomarkers

Frequently measured alongside

PotassiumK6 tests ChlorideCl6 tests GlucoseGluc6 tests Serum CreatinineCr6 tests Estimated Glomerular Filtration RateeGFR6 tests Blood Urea NitrogenBUN5 tests Calcium (Total)Ca4 tests BUN:Creatinine RatioBUN:Cr3 tests

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