What is the reference range for Cortisol Awakening Response (Delta)?

The standard reference range for Cortisol Awakening Response (Delta) is Typically an increase of ≥50% or an absolute rise of ≥5–10 nmol/L; method-specific.. Reference ranges vary by laboratory and assay platform — interpret in context of the issuing laboratory's stated range.

Which tests measure Cortisol Awakening Response (Delta)?

Cortisol Awakening Response (Delta) is measured in 1 test on BiomarkersLabs.com, including CAR Add-On.

Biomarker Reference · CAR Δ

What does the Cortisol Awakening Response (Delta) test measure?

Cortisol Awakening Response (Delta) (CAR Δ) is a clinical biomarker used in adrenal-stress assessment. The cortisol awakening response is a derived marker calculated as the difference (or percentage change) between the 30-minute post-waking sample and the awakening baseline. It is measured in 1 laboratory test on BiomarkersLabs.com.

Reference Range: Typically an increase of ≥50% or an absolute rise of ≥5–10 nmol/L; method-specific.
Units: nmol/L, ng/mL, %
Measured In: 1 test
Category: Adrenal

Functional medicine optimalNo consensus optimal range exists; interpretation is contextual and should be integrated with symptoms, other diurnal cortisol time-points, and DHEA if available.

What is Cortisol Awakening Response (Delta)?

The cortisol awakening response is a derived marker calculated as the difference (or percentage change) between the 30-minute post-waking sample and the awakening baseline. It represents the acute HPA-axis response to the transition from sleep to wakefulness and is sensitive to both psychological state and sleep architecture.

Why is Cortisol Awakening Response (Delta) measured?

A reduced or absent CAR has been reported in populations with burnout, post-traumatic stress disorder, chronic fatigue, and certain autoimmune conditions, though causality and clinical specificity remain under investigation. An exaggerated CAR may reflect heightened anticipatory stress. The CAR is used as a functional marker in integrative and functional-medicine settings but is not a stand-alone diagnostic tool.

Reference ranges

Standard reference: Typically an increase of ≥50% or an absolute rise of ≥5–10 nmol/L; method-specific.
Functional medicine optimal: No consensus optimal range exists; interpretation is contextual and should be integrated with symptoms, other diurnal cortisol time-points, and DHEA if available.
Units: nmol/L, ng/mL, %

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

Tests that measure Cortisol Awakening Response (Delta)

1 test on BiomarkersLabs.com include this biomarker.

BML-ADR-027Comprehensive

CAR Add-On

Cortisol Awakening Response (Delta) reference range in this test: Typically an increase of ≥50% or an absolute rise of ≥5–10 nmol/L; method-specific.

Related clinical conditions

Related Biomarkers

Frequently measured alongside

Awakening CortisolC02 tests Cortisol 30 Minutes Post-WakingC301 test

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