Cortisol Awakening Response Profile



Test Details

Test Company: ZRT
Test Type:
Collection Location:
 At Home

The Cortisol Awakening Response – also called CAR – reveals more detailed clues that help in assessing adrenal hormone/HPA Axis dysfunction. This testing is often useful for cases of PTSD, major depression, chronic fatigue syndrome and other severe stress conditions.

During a normal cortisol awakening response, adrenal hormone levels should increase 50% in the first 30 minutes after waking for the day and then begin to progressively drop through the afternoon and evening. To capture this response, three – rather than one – morning saliva collections are needed to properly chart the diurnal cortisol curve.

Collection Instructions & Videos



  • Your provider will notify you when results are in and schedule a follow-up to review them together

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If you have any specific questions on collecting your sample, please reach out to ZRT at: (503) 466-2445.

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