Test library
Kidney Creatinine Urine Test
A creatinine urine test measures creatinine in a urine sample, helping assess kidney function and supporting calculations such as creatinine clearance and protein ratios.
Order Creatinine Random Urine Test
Order online and visit a local collection site, or choose an at-home kit where available. No referral and no insurance required.
Order Creatinine Random Urine Test- Typical turnaround
- 1-3 business days
- Starting price
- From $45
- Results
- Confidential, online
Quick answer
The creatinine urine test measures the amount of creatinine excreted in urine. Creatinine is a waste product from normal muscle activity, and the kidneys filter it steadily. A urine measurement is often paired with a blood creatinine value to calculate how well the kidneys are clearing waste. A healthcare provider interprets the result with your kidney function and overall health.
What this test measures
This test quantifies creatinine in a urine sample, either as a random collection or as part of a timed collection. Creatinine is produced at a fairly steady rate, so its concentration in urine provides information about kidney handling and urine concentration. Urine creatinine is also used as a denominator for ratios such as protein-to-creatinine and albumin-to-creatinine, which help evaluate kidney health. Results are compared with laboratory reference ranges.
A urine sample is collected in a clean container at a partner laboratory. For a random test, a single void is sufficient, while a timed collection captures all urine produced over a set period. The laboratory measures creatinine with a chemistry method, and combining the urine value with a serum creatinine allows calculation of creatinine clearance. Urine volume and specific gravity may be reported to help interpret concentration.
People order this test when kidney function is being evaluated, when monitoring a condition that can affect the kidneys, or when a provider is investigating abnormal protein or albumin in urine. It is a supporting test rather than a standalone diagnosis. A qualified healthcare provider should interpret the result with your blood creatinine, eGFR, and clinical history.
- Urine creatinine concentration
- Urine volume when a timed collection is used
- Creatinine clearance calculated with a serum sample
- Protein-to-creatinine ratio
- Albumin-to-creatinine ratio
- Urine specific gravity
Why people order this test
- Assess kidney filtration when combined with blood creatinine
- Support protein or albumin ratio calculations
- Monitor kidney function over time
- Investigate changes in urination or fluid balance
- Evaluate urine concentration and dilution
How to prepare
A random urine sample is collected in a clean container, and no fasting is usually required. If a timed collection is requested, follow the start and stop instructions exactly and store the container as directed. Stay normally hydrated unless told otherwise.
Understanding your results
Results are generally available within one to three business days. The report shows a urine creatinine concentration and may include ratios or clearance calculations. A healthcare provider should interpret the findings with your blood kidney markers and medical history.
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Frequently Asked Questions
Why measure creatinine in urine?
Urine creatinine helps assess kidney function and is used as a reference for ratios such as protein-to-creatinine when evaluating kidney health.
Is a 24-hour collection required?
Not always. A random sample is often sufficient, though a timed collection may be requested when more precise measurement is needed.
How does urine creatinine relate to blood creatinine?
Combining the two allows calculation of creatinine clearance, which estimates how effectively the kidneys are filtering waste.
Do I need to fast?
Fasting is not typically required for urine creatinine testing unless other tests in your order call for it.
Can dehydration affect the result?
Yes. Hydration status affects urine concentration, which is why ratios and sometimes specific gravity are used for interpretation.
Ready to get tested?
Order online and visit a collection site near you, or choose a mail-in kit. No referral and no insurance required.
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