Urine Test: A Complete Patient Guide to Understanding Your Urine Collection and Laboratory Analysis Process
This test measures steroid hormone breakdown products in your urine to help determine the cause of excess cortisol production (Cushing's syndrome).
{"Measures 17-ketogenic steroids, which are waste products from steroid hormones like cortisol","Requires collecting all urine for 24 hours in a special container","The sample is collected after taking high-dose dexamethasone medication to help diagnose the cause of Cushing's syndrome","The test helps doctors distinguish between pituitary, adrenal, or ectopic sources of excess cortisol"}
Key facts at a glance
- LOINC
- 1577-6
- Short code
- 17-KGS
- Synonyms
- 17KGS 48h p 2 mg Dex 24h Ur-mRate
- Category
- chemistry
- Sample
- urine
- Container
- 24-hour urine collection container (brown or amber plastic container with preservative)
- Units
- N/A
- Ref low
- 3
- Ref high
- 23
- Critical range
- — – 4 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- Gas Chromatography-Mass Spectrometry (GC-MS) or Colorimetric Assay
- CPT
- 80378
- SNOMED
- 30981001
- Specimen volume
- Complete 24-hour urine collection, minimum 50 mL aliquot for testing
- Stability
- Refrigerated: 7 days; Frozen at -20°C: 30 days. Protect from light.
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 48–168 hours
- Order
- routine
What is this urine test and what important health information can it provide to your doctor about your condition?
The 17-ketogenic steroids test measures the amount of steroid hormone breakdown products (metabolites) in your urine. These metabolites are produced when your body breaks down hormones like cortisol and androgens. The test is performed after taking a high-dose medication called dexamethasone, which is part of a special test called the high-dose dexamethasone suppression test. This test helps doctors understand why your body may be producing too much cortisol (a condition called Cushing's syndrome).
To prepare for the urine test, you should drink a normal amount of water, avoid strenuous exercise, and tell your healthcare provider about any prescription or over-the-counter medications you are currently taking.
Your doctor will give you specific instructions about taking the dexamethasone medication. Typically, you will take 2 mg of dexamethasone every 6 hours for 2.5 days (a total of 10 doses). It is important to take the medication exactly as prescribed. You should inform your doctor about all medications you are taking, as certain drugs can affect the test results. Avoid strenuous exercise and excessive stress during the collection period, as these can affect hormone levels.
How is the urine collected and what specific steps should you follow to provide a clean and valid sample at the clinic?
You will receive a special container from the laboratory for collecting your urine. On the morning you start collecting (48 hours after beginning dexamethasone), empty your bladder completely and record the time. From that point, collect ALL urine for the next 24 hours. This means every time you urinate, you must collect the urine in the container provided. Keep the container refrigerated or in a cool place. At the end of 24 hours, empty your bladder one final time and add this sample to the container. Return the container to the laboratory as instructed.
What happens after the test is completed and when will your physician contact you with the laboratory results and next steps?
The laboratory will analyze your urine sample to measure the amount of 17-ketogenic steroids. Your doctor will interpret the results along with other test results to determine the cause of your symptoms. The results help distinguish between different causes of excess cortisol production, such as a pituitary tumor, adrenal tumor, or ectopic ACTH production. Your doctor will discuss the results with you at a follow-up appointment.
Reference range
Males: 5-23 mg/24h; Females: 3-15 mg/24h. Post-dexamethasone suppression: <4 mg/24h suggests normal adrenal function; >4 mg/24h indicates possible Cushing's syndromeN/A
Patient collects 24-hour urine specimen beginning 48 hours after starting dexamethasone 2mg PO every 6 hours for 2.5 days. Maintain normal diet and fluid intake. Avoid vitamin supplements containing ascorbic acid. Record collection start and end times. Keep container refrigerated during collection.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test is primarily used to diagnose and differentiate the causes of Cushing's syndrome. In pituitary Cushing's disease (a benign pituitary tumor producing ACTH), high-dose dexamethasone usually suppresses cortisol production, leading to lower 17-ketogenic steroid levels. In adrenal Cushing's (adrenal adenoma or carcinoma) or ectopic ACTH production, cortisol production typically does not suppress, so 17-ketogenic steroid levels remain elevated. This information helps guide treatment decisions, including whether surgery or other therapies are needed.
Frequently asked questions
Why do I need to take dexamethasone before this test?
What happens if I miss a dose of dexamethasone?
Are there any side effects from the dexamethasone medication?
Can I exercise during the urine collection period?
What do the results mean?
Sources
- 1
- 2
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy