Understanding Your Laboratory Test: Why It Is Done, How It Is Performed, and What the Results Mean for Your Health
A urine ammonia test measures the amount of ammonia in your urine, helping doctors evaluate how your body processes and eliminates nitrogen waste.
{"The test measures ammonia levels in urine to assess liver and kidney function","Elevated levels may indicate liver disease, metabolic disorders, or renal tubular acidosis","A clean-catch urine sample is required; no special preparation is typically needed","Results help doctors diagnose and monitor certain medical conditions","This is a simple, non-invasive test with no significant risks"}
Key facts at a glance
- LOINC
- 111078-2
- Short code
- Ammonia Msmt Ur
- Synonyms
- Ammonia Msmt Ur
- Category
- chemistry
- Sample
- urine
- Container
- Sterile urine container
- Units
- N/A
- Critical range
- — – 200 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Specimen volume
- 10 mL
- Stability
- Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 4–24 hours
- Order
- routine
What is this test? This test is a laboratory procedure that measures specific substances in a sample of your blood or other body fluid. Your doctor may order it to check how well certain organs are working, to help diagnose a medical condition, or to monitor treatment you are already receiving.
The urine ammonia test measures the concentration of ammonia in your urine. Ammonia is a waste product that comes from the breakdown of proteins in your body. Normally, your liver converts ammonia into urea, which your kidneys then filter and excrete in urine. This test helps doctors understand how well your body is processing and eliminating this waste product.
How is the test performed? A trained health professional will collect a small sample, usually by drawing blood from a vein in your arm with a sterile needle, and the sample is then sent to a laboratory where specialized equipment and trained staff analyze it and report the findings to your doctor.
You will provide a urine sample using the clean-catch method. This involves cleaning your genital area before collecting a mid-stream urine sample in a sterile container. The sample is then sent to a laboratory for analysis. Your healthcare provider may ask you to avoid certain foods, medications, or supplements before the test, so follow any specific instructions provided.
What do the results mean? Your results show whether the measured values fall within the normal reference range for your age and sex. Abnormal values may suggest infection, inflammation, organ dysfunction, or other conditions, but only your healthcare provider can interpret them in the context of your medical history and determine whether any follow-up testing is needed.
Normal urine ammonia levels vary depending on factors like diet, hydration status, and individual metabolism. Your doctor will interpret your results based on your overall health, symptoms, and other test findings. Both elevated and decreased ammonia levels can provide important information about your health status.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Elevated urine ammonia levels may indicate liver disease or impaired liver function, as the liver is responsible for converting ammonia into urea. It may also suggest renal tubular acidosis, a condition where the kidneys fail to properly acidify urine. Other causes include high-protein diets, dehydration, certain metabolic disorders, or the use of certain medications.
Decreased urine ammonia levels are less common but may be seen with low-protein diets, certain kidney disorders, or during periods of excessive hydration. The test is often used in conjunction with other liver and kidney function tests to provide a complete picture of your metabolic health.
Frequently asked questions
Why would my doctor order a urine ammonia test?
Do I need to fast before the test?
Are there any risks associated with this test?
How long does it take to get results?
What other tests might be done along with urine ammonia?
Sources
- 1MedlinePlus - AmmoniaSource
- 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 17, 2026. · Read our editorial policy