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Cortisol, Total details

What Cortisol, Total shows

Cortisol, often called your primary 'stress hormone,' is produced by the adrenal glands and plays roles well beyond stress response, including regulating blood sugar, blood pressure, metabolism, and inflammation. It follows a natural daily rhythm, typically highest in the morning and lowest at night, so timing matters when interpreting results, and sometimes multiple samples are collected across the day. Consistently high cortisol can point toward Cushing's syndrome (from a pituitary or adrenal tumor, or long-term steroid medication use) and cause symptoms like weight gain, high blood pressure, and skin changes. Consistently low cortisol can point toward adrenal insufficiency (Addison's disease or a pituitary problem) and cause fatigue, low blood pressure, and weight loss. Because levels vary so much throughout the day and in response to stress, single results are often followed up with more specific dynamic testing (like an ACTH stimulation test) when a disorder is suspected.

Higher cortisol can point to stress or excess cortisol

Often from stress, illness or poor sleep. Rarely, Cushing's syndrome. Steroid medicines can lower cortisol or skew the test, depending on the drug and the lab method.

Lower cortisol can point to underactive adrenal glands

Often seen with tiredness, weakness, dizziness on standing or weight loss.

Who might consider it:

  • Ongoing tiredness, weakness or dizziness
  • Weight gain around the middle, easy bruising or high blood pressure
  • Long-term use of steroid medicines, or stopping them
  • A cortisol result outside the range that needs a closer look

What can affect your result

Time of day

Cortisol peaks in the early morning and falls through the day. The time of draw matters.

Stress, sleep and illness

Acute stress, a poor night's sleep or being unwell can raise cortisol.

Estrogen and birth control

They raise the protein that carries cortisol, so total cortisol reads higher.

Preparation

  • Have your blood drawn in the morning, usually between 7 and 9 am, unless your provider asks for a different time.
  • Avoid strenuous exercise for 24 hours before your draw.
  • Tell your provider about steroid medicines, including creams, inhalers and injections, and any birth control or estrogen.
  • Pause biotin supplements before your draw as your lab or provider advises.

Tests that include Cortisol, Total

Quest Not offered
Quest Not offered
Quest Not offered
Quest Not offered
Labcorp Not offered
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