Cortisol is a stress hormone produced by the adrenal glands and is the primary agent used in our body’s flight or fight response to threatening stimuli. Levels naturally peak in the morning and then reach their lowest point at night. A high blood cortisol level at night may indicate a problem with the adrenal glands; however, individuals who work at night and sleep during the day will have an inversed pattern.

This test it performed to help diagnose primary adrenal insufficiency (Addison disease) and to detect conditions affecting the pituitary gland (secondary adrenal insufficiency). The test is performed when your cortisol level is low and/or your healthcare provider suspects that your adrenal glands are not producing enough of the hormone cortisol or that the pituitary gland is not producing enough adrenocorticotropic hormone (ACTH).

Cortisol is a stress hormone produced by the adrenal glands and is the primary agent used in our body’s flight or fight response to threatening stimuli.

Cortisol, often referred to as the "stress hormone," is a steroid hormone produced by the adrenal glands in response to signals from the hypothalamic-pituitary-adrenal (HPA) axis. It plays a vital role in regulating metabolism, immune responses, blood pressure, and the body's stress response. Measuring cortisol levels in saliva provides a non-invasive and accurate way to evaluate the body's cortisol production throughout the day.

Cortisol is a stress hormone produced by the adrenal glands and is the primary agent used in our body’s flight or fight response to threatening stimuli.

Cortisol is a stress hormone produced by the adrenal glands and is the primary agent used in our body’s flight or fight response to threatening stimuli.

Cortisol is a stress hormone produced by the adrenal glands and is the primary agent used in our body’s flight or fight response to threatening stimuli.

Cortisol is a stress hormone produced by the adrenal glands and is the primary agent used in our body’s flight or fight response to threatening stimuli.

The cortisol AM saliva test measures free (unbound) cortisol in a saliva sample collected during the morning peak window (7–9am), when cortisol is at its highest point in the daily cycle. Unlike a serum cortisol blood test, salivary cortisol measures only the biologically active free fraction — unaffected by cortisol-binding globulin. The test is specifically timed to the morning peak because cortisol follows a predictable circadian rhythm. Normal morning salivary cortisol is approximately 3–40 nmol/L on most platforms, though reference ranges vary significantly by assay — always use your lab's stated range. The test is used to assess adrenal function and HPA axis activity.

Cortisol is produced by the adrenal glands in response to stressors, both daily (e.g. waking up, low blood sugar) and unusual (e.g. emotional upset, infections, injury, surgery). Cortisol levels are highest in the morning, and then drop steadily throughout the day to their lowest point during sleep.

Cortisol is essential in regulating and mobilizing the immune system against infections and reducing inflammation. It helps to mobilize glucose, the primary energy source for the brain, and maintain normal blood sugar levels. While normal levels of cortisol are essential for life and optimal functioning of other hormones, particularly thyroid hormone, chronically elevated levels can be detrimental to health. Stress and persistently elevated cortisol levels can contribute to premature aging and chronic illness.

Under the direction of the hypothalamus and pituitary, and controlled by a negative feedback loop, the zona fasciculata of the adrenal cortex is stimulated to produce cortisol in response to circadian peaks and troughs in ACTH synthesis in addition to various types of stressors such as emotional/psychological, physical (injury, exercise), chemical, pathological (viruses, bacteria, etc.).

The feedback loop is commonly referred to as the hypothalamic-pituitary-adrenal (HPA) axis.

In a normal nonstressed state cortisol production is at its highest upon waking and declines steadily during the day, reaching its lowest point at bedtime.

Cortisol is produced by the adrenal glands in response to stressors, both daily (e.g. waking up, low blood sugar) and unusual (e.g. emotional upset, infections, injury, surgery). Cortisol levels are highest in the morning, and then drop steadily throughout the day to their lowest point during sleep.

Cortisol is essential in regulating and mobilizing the immune system against infections and reducing inflammation. It helps to mobilize glucose, the primary energy source for the brain, and maintain normal blood sugar levels. While normal levels of cortisol are essential for life and optimal functioning of other hormones, particularly thyroid hormone, chronically elevated levels can be detrimental to health. Stress and persistently elevated cortisol levels can contribute to premature aging and chronic illness.

Cortisol is produced by the adrenal glands in response to stressors, both daily (e.g. waking up, low blood sugar) and unusual (e.g. emotional upset, infections, injury, surgery). Cortisol levels are highest in the morning, and then drop steadily throughout the day to their lowest point during sleep.

Cortisol is essential in regulating and mobilizing the immune system against infections and reducing inflammation. It helps to mobilize glucose, the primary energy source for the brain, and maintain normal blood sugar levels. While normal levels of cortisol are essential for life and optimal functioning of other hormones, particularly thyroid hormone, chronically elevated levels can be detrimental to health. Stress and persistently elevated cortisol levels can contribute to premature aging and chronic illness.

Cortisol is a stress hormone produced by the adrenal glands and is the primary agent used in our body’s flight or fight response to threatening stimuli.

Cortisol is a stress hormone produced by the adrenal glands and is the primary agent used in our body’s flight or fight response to threatening stimuli.

Cortisol is a stress hormone produced by the adrenal glands and is the primary agent used in our body’s flight or fight response to threatening stimuli.

Cortisol is a stress hormone produced by the adrenal glands and is the primary agent used in our body’s flight or fight response to threatening stimuli.

Cortisol is a hormone produced by the adrenal glands, which are located on top of the kidneys. It is normally released in response to events and circumstances such as waking up in the morning, exercising, and acute stress.

In the Dutch test there are 4 individual free cortisol readings that were measured at different times throughout one day:

- Cortisol A (Waking)

- Cortisol B (Morning)

- Cortisol C (Afternoon)

- Cortisol D (Night)

When you are looking at Cortisol A (Waking) it is essential to also look at Cortisol B (Morning). The difference between those 2 cortisol samples is called the cortisol awakening response (or CAR). 

An elevated CAR would mean that the difference between those 2 markers is really big.

Different possible reasons for an elevated CAR:

- an overactive HPA axis (=plays an important role in the stress response), ongoing job-related stress (anticipatory stress for the day)

- blood sugar dysregulation

- pain (i.e. waking with painful joints or a migraine), 

- and general depression (not Seasonal affective disorder/”winter depression”)

Neither the waking nor post-waking cortisol results correlated to Major Depressive Disorder, but the CAR calculation (the change between the first two samples) does. So this means that if your morning free cortisol reading spikes up high first thing in the morning, there is something to look at. Is there an overactivity to stress? Are you anticipating a stressful day at work? If your morning free cortisol levels are high, this can be due to stress or anticipating stress. 

Cortisol is a stress hormone produced by the adrenal glands and is the primary agent used in our body’s flight or fight response to threatening stimuli.