When patients suffer from insomnia, the 5 salivary cortisol measurements on the DUTCH Plus may not be enough to assess cortisol’s potential role in the sleep disturbances. Salivary measurements typically begin when the patient wakes and rises in the morning. It would be very helpful to also provide cortisol levels in the middle of the night when the patient is struggling to sleep. Determining cortisol’s potential role will help the provider treat the patient’s insomnia with precision. The DUTCH Plus now offers insight into this question.
- Free cortisol values throughout the day, including at bedtime
- A high bedtime sample may hinder sleep.
- Overnight melatonin production
- Low melatonin production may contribute to insomnia
- Progesterone levels
- Particularly in perimenopausal, low progesterone may be associated with poor sleep
- As the primary metabolite of norepinephrine and epinephrine, high levels may be found in patients in sympathetic overdrive, which may lead to insomnia if persistent at night.
- The new Insomniac Cortisol measurement
- This new measurement offers valuable additional information about cortisol’s potential causal role in sleep disturbances.
- Note: while the above markers are included in the DUTCH Plus, the Insomniac Cortisol measurement is optional and included at an additional charge of $25.
What is the Cortisol Awakening Response and how do we test for it?
When we open our eyes upon waking, cortisol levels naturally begin to rise by an average of 50%. 30 minutes after waking, cortisol levels will still show this sharp increase. By 60 minutes after waking, cortisol levels have peaked and begin to decline. Measuring this rise and fall of cortisol levels at waking can be used as a “mini stress test”. Research shows that the size of this increase correlates with HPA-axis function, even if the sample measurements are all within range. A quick saturation of saliva swabs upon waking, and at 30 and 60 minutes after waking, provide what is required to assess a patient’s Cortisol Awakening Response.
A low or blunted Cortisol Awakening Response
This can be a result of an underactive HPA axis, excessive psychological burnout, seasonal affective disorder
(SAD), sleep apnea or poor sleep in general, PTSD, chronic fatigue and/or chronic pain. A decreased CAR has also been associated with systemic hypertension, functional GI diseases, postpartum depression, and autoimmune diseases.
An elevated Cortisol Awakening Response
This can be a result of an over-reactive HPA axis, ongoing job-related stress (anticipatory stress for the day), glycemic dysregulation, pain (i.e. waking with painful joints or a migraine), and general depression (not SAD). A recent study1 showed that neither the waking nor post-waking cortisol results correlated to Major Depressive Disorder, but the CAR calculation (the change between the first two samples) did. This measurement of the response to waking has independent clinical value showing dysfunction that may be hidden by current testing options.
A true CAR assessment requires salivary samples to be collected at the moment of waking, and twice more, at 30 minutes after waking and 60 minutes after waking. These specifically timed collections are difficult and impractical with urine and traditional salivary options. The DUTCH PlusTM uses specialty, FDA-approved, and patented collection devices called SalivettesTM. SalivettesTM are specifically made for testing cortisol when timing needs to be precise and are used in nearly all of the published CAR studies. The small synthetic cotton swab can be quickly saturated with saliva, providing a very fast and simple collection. Unfortunately for labs using saliva to test reproductive hormones, they are not a viable option as the swabs cannot be used when testing progesterone. The DUTCH PlusTM offers the most accurate salivary cortisol sampling with SalivetteTM collection and analysis using LC-MS/ MS. An unparalleled clinical tool is created when combining salivary cortisol with the extensive urine metabolites from DUTCH.