What is the reference range for Serum Cortisol (Waking)?

The standard reference range for Serum Cortisol (Waking) is Method-specific; typically 10–25 nmol/L or approximately 3.6–9.0 ng/mL in saliva at waking.. Reference ranges vary by laboratory and assay platform — interpret in context of the issuing laboratory's stated range.

Which tests measure Serum Cortisol (Waking)?

Serum Cortisol (Waking) is measured in 2 tests on BiomarkersLabs.com, including Cortisol, 5 Specimens, Saliva 4-Point Cortisol (Diurnal Profile).

Biomarker Reference · Cortisol-0h

What does the Serum Cortisol (Waking) test measure?

Serum Cortisol (Waking) (Cortisol-0h) is a clinical biomarker used in adrenal-stress assessment. Cortisol is the principal glucocorticoid secreted by the zona fasciculata of the adrenal cortex under control of adrenocorticotropic hormone. It is measured in 2 laboratory tests on BiomarkersLabs.com.

Reference Range: Method-specific; typically 10–25 nmol/L or approximately 3.6–9.0 ng/mL in saliva at waking.
Units: nmol/L, µg/dL, ng/mL
Measured In: 2 tests
Category: Adrenal

Functional medicine optimalFunctional practitioners often seek a morning cortisol in the upper-middle portion of the laboratory reference (around 400–600 nmol/L), reflecting robust but not excessive HPA tone; rigid thresholds are contested.

What is Serum Cortisol (Waking)?

Cortisol is the principal glucocorticoid secreted by the zona fasciculata of the adrenal cortex under control of adrenocorticotropic hormone. It follows a pronounced diurnal rhythm, with peak secretion shortly after waking driven by the hypothalamic-pituitary-adrenal axis's anticipatory rise and the cortisol awakening response. This specimen captures the morning nadir immediately upon waking, before the awakening surge begins.

Why is Serum Cortisol (Waking) measured?

The waking cortisol establishes the baseline for the diurnal slope. A blunted morning peak may indicate HPA axis hypofunction, chronic stress adaptation, or primary adrenal insufficiency when very low. An exaggerated peak can reflect acute stress or anxiety, though salivary free cortisol at waking is usually robust in healthy individuals.

Reference ranges

Standard reference: Method-specific; typically 10–25 nmol/L or approximately 3.6–9.0 ng/mL in saliva at waking.
Functional medicine optimal: Functional practitioners often seek a morning cortisol in the upper-middle portion of the laboratory reference (around 400–600 nmol/L), reflecting robust but not excessive HPA tone; rigid thresholds are contested.
Units: nmol/L, µg/dL, ng/mL

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

Tests that measure Serum Cortisol (Waking)

2 tests on BiomarkersLabs.com include this biomarker.

BML-ADR-032Comprehensive

Cortisol, 5 Specimens

Serum Cortisol (Waking) reference range in this test: Typically 275–700 nmol/L (10–25 µg/dL) in early morning; assay- and time-dependent.

BML-ADR-007Comprehensive

Saliva 4-Point Cortisol (Diurnal Profile)

Serum Cortisol (Waking) reference range in this test: Method-specific; typically 10–25 nmol/L or approximately 3.6–9.0 ng/mL in saliva at waking.

Related clinical conditions

Related Biomarkers

Frequently measured alongside

Cortisol (evening)Cortisol-PM5 tests Serum Cortisol (Bedtime)Cortisol-Night2 tests Serum Cortisol (30 Minutes Post-Waking)Cortisol-30m1 test Cortisol (afternoon specimen)Cortisol PM4 tests Cortisol Awakening ResponseCAR6 tests Cortisol (Midday Sample)Cortisol Noon1 test Cortisol Diurnal SlopeDiurnal Slope1 test

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