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Diurnal Cortisol (Cx4) - ZRT Test Kit

The diurnal cortisol test kit tests cortisol levels four times in a 24-hour period.

Sample Report

Test Code: ZRTDC

Also Known As:


Specimen Type: Saliva


No fasting required. Specimen must be sent to lab by overnight mail Monday-Thursday only. Please read patient instructions very carefully and decide the ideal day for you to begin test.

Test Results:

5-7 days once the lab receives the specimen. May take longer based on weather, holiday or lab delays.


The Diurnal Cortisol (Cx4) test kit checks the levels of cortisol, an adrenal hormone. As a response to stress, the adrenal glands release cortisol. Chronic fatigue, "adrenal burnout" and other health problems can result from prolonged high production of cortisol.

This test samples the levels of cortisol four times a day, showing a full daily cycle. Saliva samples are taken four times (morning, noon, evening, and night) over 24 hours.

This home test kit is recommended for individuals experiencing long-term situational fatigue and stress, which indicates adrenal imbalance.

Cortisol amounts undergo diurnal variation, with the highest levels in the early morning and the lowest levels about midnight or 3-5 hours after sleep onset.

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