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Also reported in: nmol/L, µg/dL
Your afternoon cortisol is within the normal range and is appropriately declining from the morning peak. This is part of the normal diurnal cortisol rhythm.
Your afternoon cortisol is critically low. The adrenal glands may not be producing enough cortisol throughout the day. Critical cortisol insufficiency can cause life-threatening adrenal situation, particularly under physical stress. Addison's disease or pituitary failure must be excluded.
Seek urgent endocrinology evaluation. Cortisol stimulation (Synacthen) test and comprehensive adrenal function assessment are needed immediately. If you experience episodes of noticeable fatigue, nausea, or dizziness, seek emergency care.
Afternoon cortisol critically low (<1 mcg/dL) — noticeable adrenal insufficiency possibleYour afternoon cortisol is below the reference range. Low afternoon cortisol can indicate Your brain–adrenal stress system (the HPA axis) dysregulation, 'adrenal fatigue' (a pattern of blunted cortisol secretion), adrenal insufficiency, or chronic stress-induced adrenal exhaustion. Symptoms include fatigue, low energy, and difficulty coping with stress.
Seek endocrinology evaluation. Cortisol stimulation testing should be arranged to distinguish between primary adrenal insufficiency and HPA dysfunction. Lifestyle factors (sleep, stress, nutrition) should be comprehensively reviewed.
Afternoon cortisol below reference range — reduced adrenal output or HPA axis fatigueYour afternoon cortisol is at the lower end of normal. This may reflect mild Your brain–adrenal stress system (the HPA axis) fatigue or suboptimal adrenal function that warrants monitoring.
Prioritize sleep quality, reduce chronic stress, and ensure adequate nutrition. Discuss with your doctor if fatigue is a prominent symptom.
Afternoon cortisol: low-normal — borderline HPA axis outputYour afternoon cortisol is within the normal range and is appropriately declining from the morning peak. This is part of the normal diurnal cortisol rhythm.
No specific action required.
Afternoon cortisol within normal reference range — normal diurnal cortisol declineYour afternoon cortisol is in the optimal range, reflecting a healthy diurnal cortisol rhythm with appropriate afternoon decline.
No action needed.
Afternoon cortisol: optimal — healthy diurnal decline in progressYour afternoon cortisol is above the reference range. Cortisol should be declining significantly by the afternoon in a healthy diurnal pattern. An elevated afternoon cortisol suggests Your brain–adrenal stress system (the HPA axis) dysregulation, chronic stress, or early Cushing's syndrome. High afternoon cortisol impairs memory, sleep, immune function, and metabolic health.
Discuss with your doctor. Cushing's syndrome evaluation (24-hour urine free cortisol, late-night salivary cortisol) may be indicated. Stress management, sleep optimization, and lifestyle review are important.
Afternoon cortisol above reference range — blunted diurnal decline; HPA dysregulation possibleYour afternoon cortisol is significantly elevated. A high cortisol level in the afternoon indicates that the normal diurnal decline has failed. This pattern is associated with chronic unrelenting stress, Cushing's syndrome, depression, and post-traumatic stress disorder. Chronically high cortisol causes glucose intolerance, immune suppression, muscle loss, weight gain, and sleep disruption.
Seek endocrinology evaluation. Screening for Cushing's syndrome (overnight dexamethasone suppression test, 24-hour urine free cortisol) should be arranged. Comprehensive stress and mental health assessment is important.
Afternoon cortisol significantly elevated — likely HPA dysregulation or Cushing's syndrome; investigation requiredYour afternoon cortisol is critically elevated, raising serious concern for Cushing's syndrome (cortisol excess from pituitary tumor, adrenal tumor, or ectopic ACTH). Cushing's syndrome causes progressive weight gain, diabetes, hypertension, osteoporosis, muscle wasting, and psychiatric disturbance.
Seek urgent endocrinology evaluation. Cushing's syndrome confirmation testing and pituitary/adrenal imaging should be arranged without delay.
Afternoon cortisol critically elevated — Cushing's syndrome strongly suspected; urgent evaluation requiredUpload your lab report and get your actual values interpreted in plain English — instantly, with no medical training required.