Cortisol in Urine Test
Test Overview
A cortisol test measures the level of the hormone, Opens dialog cortisol in a 24-hour sample of urine. The cortisol level may show problems with the adrenal glands, Opens dialog or the pituitary gland, Opens dialog. Cortisol is made by the adrenal glands. Cortisol levels get higher when the pituitary gland releases adrenocorticotropic hormone, Opens dialog (ACTH).
Cortisol has many functions. It helps the body use sugar (glucose) and fat for energy (metabolism, Opens dialog). It helps the body manage stress. Cortisol levels can be affected by many things, such as physical or emotional stress, strenuous activity, infection, or injury.
Normally, cortisol levels rise during the early morning hours and are highest about 7 a.m. They drop very low in the evening and during the early phase of sleep. But if you sleep during the day and are up at night, this pattern may be reversed. If you do not have this daily change in cortisol levels, you may have overactive adrenal glands.
Cortisol levels vary widely throughout the day, so you collect urine over 24 hours for this test.
A cortisol, Opens dialog test is done to find problems of the pituitary gland or adrenal glands, such as making too much hormone.
You may be asked to avoid strenuous physical activity the day before the test.
Be sure to drink enough fluids during the 24-hour urine test. This prevents dehydration, Opens dialog.
This test is usually done at home. You must collect all the urine you produce in a 24-hour period.
- When you first get up in the morning, urinate into the toilet. Don't save this urine. This marks the start of your 24-hour period.
- For the next 24 hours, collect all your urine. Your doctor or lab will give you a large container to store it in. Urinate into a separate small, clean container. Then pour the urine into the large container. Don't touch the inside of the containers with your fingers.
- Keep the large container in the refrigerator.
- Empty your bladder for the last time at or just before the end of the 24-hour period. Add this urine to the large container, and write down the time.
- Do not get toilet paper, pubic hair, stool (feces), menstrual blood, or anything else in your urine sample.
Normal
Each lab has a different range for what's normal. Your lab report should show the range that your lab uses for each test. The normal range is just a guide. Your doctor will also look at your results based on your age, health, and other factors. A value that isn't in the normal range may still be normal for you.
High values
High values of cortisol may be caused by:
- Some medicines.
- Pituitary and adrenal tumors, which are usually benign. This means they are not cancer.
- Some types of cancer, such as adrenal cancer and some rare lung cancers.
Current as of: April 30, 2024
Author: Ignite Healthwise, LLC Staff
Clinical Review Board
All Healthwise education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.
Current as of: April 30, 2024
Author: Ignite Healthwise, LLC Staff
Clinical Review Board
All Healthwise education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.
This information does not replace the advice of a doctor. Ignite Healthwise, LLC, disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. Learn how we develop our content.