Creatinine, Turbidimetric Assay, Mass Concentration
A turbidimetric assay that measures the amount of creatinine in a patient sample, most commonly used to assess kidney filtering function.
["Creatinine helps evaluate how well the kidneys are filtering waste from the blood."]
Key facts at a glance
- LOINC
- 108533-1
- Short code
- GH/Creat Msmt Ur
- Synonyms
- GH/Creat Msmt Ur
- Category
- kidney
- Sample
- urine
- Container
- Sterile urine container
- Units
- 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?
Creatinine is a waste product made by the muscles and removed from the body mainly by the kidneys. This test measures the concentration of creatinine in a sample using a turbidimetric laboratory method.
Why might I need this test?
Creatinine is commonly checked as part of a kidney function panel or estimated glomerular filtration rate. It may also be used to monitor kidney disease, dehydration, or the effects of medicines that can affect kidney function.
How is the test performed?
A laboratory adds a reagent to the sample and measures the resulting turbidity. The calculated result is reported as a creatinine concentration and is often compared with other kidney function measurements.
How do I prepare for the test?
Creatinine testing usually does not require fasting, but preparation may vary by specimen and the reason for testing. Follow your healthcare professional's instructions and tell the laboratory if you are pregnant or taking medicines that may affect kidney function.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
A higher creatinine concentration may indicate reduced kidney filtering function, dehydration, or increased muscle mass. A lower concentration can occur with low muscle mass, advanced age, or severe liver disease. Creatinine should be interpreted with the estimated filtration rate, clinical findings, and other laboratory results.
Short name
Creatinine
Frequently asked questions
Does a high creatinine level always mean I have kidney disease?
Why are my creatinine and eGFR results considered together?
Does this test require fasting?
Sources
- 1
- 2Lab Tests OnlineSource
- 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