CAR — Cortisol Awakening Response
What it measures: Six saliva samples collected across a single day — at waking, 30 minutes after waking, 60 minutes after waking, midday, afternoon and evening — mapping both your full diurnal cortisol curve and the critical cortisol awakening response, plus DHEAS and the Cort/DHEAS ratio.
Because the awakening spike is regulated separately from the rest of the daily rhythm, a single morning blood or saliva reading can miss it entirely. CAR is the clearest single test for HPA axis reactivity and is usually the right starting point for stress, fatigue or sleep-related concerns.
- SampleSaliva, 6 collections in one day
- LabNutriPath
- TurnaroundConfirmed at booking [TBC]
- Best forA focused, standalone adrenal stress snapshot