Cortisol – saliva
Saliva
Part of Endocrinology

Cortisol – Saliva (ng/mL): Understanding the Biomarker 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. Why Test Cortisol in Saliva? Salivary cortisol testing is a convenient and effective way to assess circadian cortisol rhythm, which is how cortisol levels fluctuate naturally over 24 hours. This biomarker is particularly valuable for evaluating: Stress-related conditions (e.g., chronic stress, burnout, anxiety). Adrenal function (e.g., adrenal insufficiency, adrenal fatigue, or hyperactivity). Sleep disorders (e.g., insomnia or disrupted circadian rhythm). HPA axis dysregulation, which may result from prolonged stress or illness. How Is Salivary Cortisol Measured? Salivary cortisol levels are typically measured at multiple time points throughout the day to assess the daily cortisol curve: Morning (upon waking): Cortisol is naturally highest in the morning, providing energy for the day ahead. Midday: Levels gradually decline after the morning peak. Afternoon: A further decline is expected as the day progresses. Evening and Night: Cortisol levels are at their lowest to promote relaxation and sleep. Results are reported in nanograms per milliliter (ng/mL), with specific reference ranges provided for each time point. What Do Abnormal Cortisol Levels Indicate? Elevated Cortisol Levels Possible Causes: Chronic stress or anxiety. Cushing's syndrome (excess cortisol production by the adrenal glands). Sleep disorders or disrupted circadian rhythm. Depression or psychiatric conditions. Excessive caffeine or stimulant use. Symptoms: Weight gain (especially around the abdomen). Difficulty sleeping. Fatigue or burnout. Elevated blood pressure. Suppressed immunity. Low Cortisol Levels Possible Causes: Adrenal insufficiency (e.g., Addison’s disease). Chronic fatigue syndrome or adrenal fatigue. Hypopituitarism (reduced pituitary gland function). Prolonged illness or trauma. Symptoms: Chronic fatigue or lack of energy. Difficulty coping with stress. Low blood pressure or dizziness. Muscle weakness. Low blood sugar levels (hypoglycemia). Clinical Uses of Salivary Cortisol Testing Stress and Burnout Assessment Evaluates how chronic stress affects the HPA axis and overall cortisol production. Diagnosis of Adrenal Disorders Detects adrenal insufficiency (low cortisol) or hypercortisolism (high cortisol). Sleep Disorders Identifies irregular cortisol patterns contributing to insomnia or poor sleep quality. Monitoring Treatment Progress Tracks the effectiveness of interventions aimed at regulating cortisol levels, such as stress management techniques or medications. How to Prepare for a Salivary Cortisol Test Avoid food, drinks (except water), and oral hygiene products for at least 30 minutes before sample collection. Avoid caffeine, alcohol, and intense exercise for 12-24 hours before the test. Collect saliva samples at the designated times to capture the circadian rhythm accurately. Improving Cortisol Balance Stress Management: Practice relaxation techniques such as mindfulness, yoga, or meditation. Engage in regular moderate exercise (avoid overtraining). Sleep Hygiene: Maintain a consistent sleep schedule. Create a calming bedtime routine and minimize screen time before bed. Diet and Nutrition: Focus on a balanced diet rich in whole foods, omega-3 fatty acids, and magnesium. Avoid excessive caffeine and sugar. Medical Intervention: Work with a healthcare provider to address underlying conditions affecting cortisol production. Conclusion Salivary cortisol testing provides a comprehensive view of cortisol production and HPA axis function, making it a valuable tool for diagnosing and managing stress-related conditions, adrenal disorders, and sleep disturbances. By identifying and addressing abnormal cortisol levels, individuals can take targeted steps toward restoring balance and optimizing health.

Optimal range 1.5 – 9.6 ng/mL Learn more
Cortisol (morning)
Part of ZRT Laboratory (Salivary Steroids), ZRT Laboratory

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 has a wide range of effects on mind and body and interacts with the reproductive, thyroid and immunological systems. As part of the stress response, it prepares the body for “fight or flight” by regulating epinephrine (adrenaline) biosynthesis, and in doing so it can suppress the production of other hormones, including those involved with reproduction, and some immune functions. Salivary cortisol measurements are considered the gold standard in testing stress, in screening for Cushing’s disease, and in evaluations of adrenal insufficiency, such as Addison’s disease.

Optimal range 2.5 – 6.2 ng/mL Learn more