Fasting Lipid Panel Blood Test for Heart Disease Risk Assessment
A test that measures the amount of urea nitrogen in your urine to evaluate kidney function and protein metabolism.
{"Urea nitrogen is a waste product filtered from blood by kidneys","This test helps assess how well your kidneys are working","Results can indicate kidney disease, dehydration, or protein metabolism issues","A 24-hour urine collection is typically required","Results are compared with blood urea nitrogen (BUN) for comprehensive assessment"}
Key facts at a glance
- LOINC
- 14938-5
- Short code
- UUN
- Synonyms
- UUN Ur-sCnc
- Category
- chemistry
- Sample
- urine
- Container
- Sterile urine container (plastic or glass)
- Units
- not specified
- Ref low
- 250
- Ref high
- 600
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- ≥ 0 years
- Method
- Enzymatic spectrophotometric method (urease-based reaction)
- CPT
- 84520
- SNOMED
- 104181006
- Specimen volume
- 10-50 mL for random collection; complete 24-hour collection for timed specimens
- Stability
- Room temperature: 24-48 hours; Refrigerated (2-8°C): 5-7 days; Frozen (-20°C): 2-3 months
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 4–24 hours
- Order
- routine
This fasting lipid panel is a blood test that checks total cholesterol, LDL cholesterol, HDL cholesterol, and triglycerides to help estimate heart disease risk.
The urine urea nitrogen test measures the amount of urea nitrogen in your urine. Urea is a waste product that forms when your body breaks down protein from food and muscle tissue. Normally, your kidneys filter urea from your blood and excrete it in urine. This test helps doctors understand how well your kidneys are removing this waste product from your body.
A health professional cleans your skin, inserts a small needle into a vein, usually in your arm, and collects a blood sample into a tube for lab testing.
The test usually requires a 24-hour urine collection. You will be given a special container to collect all urine produced over a 24-hour period. It's important to collect every urine sample during this time and to keep the container refrigerated or on ice. Some tests may use a single urine sample instead.
Results show the amounts of total cholesterol, LDL cholesterol, HDL cholesterol, and triglycerides in your blood and help guide follow-up care.
Normal urine urea nitrogen levels vary based on diet, kidney function, and overall health. Your doctor will interpret your results based on your specific situation, diet, and other test results. This test is often compared with blood urea nitrogen (BUN) levels to get a complete picture of kidney function.
You may need to fast for 9 to 12 hours before the blood draw, usually with water only, and you should ask your clinician about medicines and timing.
Your doctor may ask you to avoid certain foods, medications, or supplements before the test. Inform your doctor about all medications you are taking. Follow any specific instructions provided, including dietary guidelines. Stay well-hydrated unless otherwise directed by your healthcare provider.
Reference range
250-600 mmol/Lnot specified
No fasting required; random urine acceptable but 24-hour timed collection preferred for clinical interpretation
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
The urine urea nitrogen test helps evaluate kidney function by measuring how effectively the kidneys filter and excrete waste products. It assesses protein metabolism and nitrogen balance in the body. Abnormal results may indicate kidney disease, liver problems, dehydration, heart failure, or urinary tract obstruction. The test is also useful for monitoring patients on dialysis or those with known kidney disease.
Frequently asked questions
Why do I need a 24-hour urine collection?
What does high urine urea nitrogen mean?
What does low urine urea nitrogen mean?
Is the test painful?
How long does it take to get results?
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