Cortisol is your body's main stress hormone, and it follows a natural daily rhythm. High in the morning to help you wake up, gradually declining across the day, and lowest at night to let you sleep. When that rhythm gets disrupted, whether from chronic stress, poor sleep, burnout, or hormonal shifts, you can feel it in ways that are hard to pin down. Wired at night, exhausted in the morning, crashing in the afternoon, unable to wind down.
This test measures cortisol at four points across the day using simple saliva samples, giving you a picture of your actual cortisol rhythm rather than a single blood draw that only captures one moment.
Anyone, men or women, who wants to understand their body's stress rhythm.
Especially useful if you're experiencing burnout, chronic stress, sleep issues (trouble falling asleep, staying asleep, or waking up), afternoon crashes, or unexplained fatigue. Also a helpful starting point for women in perimenopause noticing changes in energy or sleep that don't fully make sense.
A single blood cortisol draw can be misleading. Cortisol rises and falls dramatically across the day, and catching it at only one moment doesn't tell you whether your rhythm is healthy.
This test captures that rhythm. It shows you whether your morning cortisol is high enough to wake you up, whether it declines properly across the day, and whether it's low enough at night to let you sleep. Those patterns can point toward what's happening with your stress response, your sleep cycle, and the broader HPA axis (the communication system between your brain, pituitary, and adrenal glands).
Cortisol measured at four points across the day from saliva samples collected at home:
Waking cortisol. Captures your morning cortisol peak, which sets the tone for your energy across the day.
Mid-morning cortisol. Shows how your cortisol is starting to decline after the morning peak.
Afternoon cortisol. Reflects your cortisol level during the typical afternoon energy dip.
Evening or bedtime cortisol. Captures whether your cortisol is low enough to allow restful sleep.
Together, these four points create a cortisol curve that reveals your rhythm across the day.
Lab results are data, not a diagnosis or a treatment plan. Cortisol patterns are influenced by sleep, stress, shift work, exercise, medications, caffeine, and many other factors. A single day's collection gives you useful information but not a complete picture.
If you'd like help understanding what your results mean and you live in Virginia, Maryland, DC, or Delaware, you can book an interpretation visit with Discreet Health for a clear, educational walk-through of your results. If you live elsewhere, we recommend following up with a licensed clinician in your state. If you're looking for a treatment plan or ongoing care, that lives in our clinical programs (only available to residents of VA, MD, DC, and DE).
Collection Method
This test uses saliva samples collected at home. You'll receive a kit with collection tubes and detailed instructions. You'll collect saliva at four specific times across a single day, typically on waking, mid-morning, afternoon, and evening or bedtime.
Timing Matters
Follow the collection time windows in your kit instructions carefully. The test is designed to capture your cortisol rhythm at specific points, and collecting too early or too late can affect the accuracy of your results.
Avoid Before Collection
Do not eat, drink (other than water), brush your teeth, or exercise for at least 30 minutes before each collection. Check your kit instructions for any additional guidance about medications, supplements, or caffeine.
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