What is the reference range for Cortisol at 20:00?

The standard reference range for Cortisol at 20:00 is Approximately 30–280 nmol/L (1–10 µg/dL) at 20:00, assay-specific.. Reference ranges vary by laboratory and assay platform — interpret in context of the issuing laboratory's stated range.

Which tests measure Cortisol at 20:00?

Cortisol at 20:00 is measured in 1 test on BiomarkersLabs.com, including Cortisol, 6 Specimens.

Biomarker Reference · 20:00 Cortisol

What does the Cortisol at 20:00 test measure?

Cortisol at 20:00 (20:00 Cortisol) is a clinical biomarker used in adrenal-stress assessment. Evening cortisol nears the diurnal nadir, typically less than 30 per cent of the morning peak. It is measured in 1 laboratory test on BiomarkersLabs.com.

Reference Range: Approximately 30–280 nmol/L (1–10 µg/dL) at 20:00, assay-specific.
Units: nmol/L, µg/dL
Measured In: 1 test
Category: Adrenal

Functional medicine optimalEvening cortisol should be less than 25–30 per cent of the morning value, ideally below 150 nmol/L (5 µg/dL).

What is Cortisol at 20:00?

Evening cortisol nears the diurnal nadir, typically less than 30 per cent of the morning peak. The normal evening decline is an important marker of hypothalamic–pituitary–adrenal integrity.

Why is Cortisol at 20:00 measured?

Loss of the evening nadir is an early biochemical sign of Cushing syndrome — many guidelines use a late-night salivary cortisol for this purpose, but serum 20:00 cortisol serves a similar role in a six-point series.

Reference ranges

Standard reference: Approximately 30–280 nmol/L (1–10 µg/dL) at 20:00, assay-specific.
Functional medicine optimal: Evening cortisol should be less than 25–30 per cent of the morning value, ideally below 150 nmol/L (5 µg/dL).
Units: nmol/L, µg/dL

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

Tests that measure Cortisol at 20:00

1 test on BiomarkersLabs.com include this biomarker.

BML-ADR-033Comprehensive

Cortisol, 6 Specimens

Cortisol at 20:00 reference range in this test: Approximately 30–280 nmol/L (1–10 µg/dL) at 20:00, assay-specific.

Related clinical conditions

Related Biomarkers

Frequently measured alongside

Cortisol at 08:0008:00 Cortisol1 test Cortisol at 12:0012:00 Cortisol1 test Cortisol at 16:0016:00 Cortisol1 test Cortisol at 23:0023:00 Cortisol1 test Cortisol at 03:0003:00 Cortisol1 test Diurnal Cortisol Slope (Derived)Cortisol Slope3 tests

Order tests measuring Cortisol at 20:00 for your patients

Available exclusively to verified licensed healthcare practitioners. CLIA-certified laboratory results delivered to your secure portal.