Creat24hfldmrate
A test that measures the amount of creatinine excreted in urine over 24 hours to evaluate kidney function and muscle mass.
{"Measures how much creatinine your kidneys filter and excrete in 24 hours","Helps assess kidney function and detect kidney disease","Also provides information about muscle mass","Requires collecting all urine produced in a 24-hour period","Results are compared with blood creatinine for accurate assessment"}
Key facts at a glance
- LOINC
- 31101-9
- Short code
- CREAT24
- Synonyms
- Creat 24h Fld-mRate
- Category
- kidney
- Sample
- serum
- Container
- 24-hour urine collection container (plastic, labeled with patient ID and collection times)
- Units
- not specified
- Ref low
- 500
- Ref high
- 2000
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- ≥ 0 years
- Method
- Jaffe reaction (colorimetric) or enzymatic method
- CPT
- 82520
- SNOMED
- 314775006
- Specimen volume
- Complete 24-hour collection (typically 1000-2000 mL depending on urine output)
- Stability
- Room temperature: 24-48 hours; Refrigerated (2-8°C): 5-7 days; Frozen (-20°C): several weeks
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 24–48 hours
- Order
- routine
What is this test?
The 24-hour urine creatinine test measures the amount of creatinine that your kidneys filter and excrete in a 24-hour period. Creatinine is a waste product produced by normal muscle metabolism, and its level in urine reflects how well your kidneys are functioning. Unlike a single urine sample, this test provides a more accurate picture of kidney function by collecting all urine produced over a full day.
How is the test performed?
You will receive a special container for urine collection. On the first day, you will begin collecting urine after your first morning void, and continue collecting for the next 24 hours, including the first morning void on the second day. Keep the container refrigerated or in a cool place during collection. It is important to collect every urine sample during the 24-hour period for accurate results.
Why is this test important?
This test is crucial for evaluating kidney function. The kidneys filter waste products like creatinine from the blood. If the kidneys are not working properly, creatinine builds up in the blood and decreases in urine. By measuring creatinine in a 24-hour urine collection, doctors can calculate how efficiently your kidneys are filtering waste.
Reference range
500-2000 mg/24 hnot specified
Complete 24-hour body fluid (typically urine) collection; refrigerate specimen during collection. Avoid strenuous exercise and high-meat diet prior to and during collection.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Frequently asked questions
Do I need to fast before this test?
What happens if I miss a urine sample during collection?
Are there any risks to this test?
How long does it take to get results?
Sources
- 1MedlinePlus - CreatinineSource
- 2
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