Creatinine (Urine)
The urine creatinine test measures creatinine excretion in a urine sample. It is used to assess renal handling and support interpretation of other urine tests.
Turnaround time
6 days
Biomarkers count
1
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Details about Creatinine (Urine)
What is the Creatinine (Urine) test?
The Creatinine (Urine) test measures the concentration of creatinine present in a urine sample. Creatinine is a metabolic by-product of muscle activity and is excreted by the kidneys.
According to the laboratory documentation, urine creatinine is commonly used as a supportive biochemical marker and as a reference value in urine-based testing. It helps contextualise and interpret other urine analytes by accounting for urine concentration.
The test is performed on a random urine (RU) sample, as listed in the laboratory guide.
Why do I need a urine creatinine test?
Urine concentration varies significantly depending on hydration, timing, and fluid intake. Measuring urine creatinine allows laboratories and clinicians to understand whether a urine sample is dilute or concentrated.
This test is frequently requested when interpreting other urine-based investigations or when assessing renal excretion patterns.
You may need a urine creatinine test if you:
- Are undergoing urine-based biochemical testing
- Need reliable interpretation of urine results
- Are completing panels that include urine markers
- Require assessment of renal excretion
- Are monitoring results over time using urine samples
- Have variable hydration levels affecting urine tests
Benefits of the Creatinine (Urine) test
- Supports interpretation of urine tests
Provides context for urine analyte concentrations. - Reflects renal excretion of creatinine
Indicates how creatinine is cleared into urine. - Accounts for urine concentration variability
Helps identify dilute or concentrated samples. - Widely used laboratory marker
Standard component of urine biochemistry. - Non-invasive testing method
Requires only a urine sample. - Useful in repeat monitoring
Allows comparison between samples over time. - Supports accuracy of urine panels
Improves reliability of urine-based investigations. - Simple and clinically recognised
Included in accredited laboratory test menus.
Step by step – how the test works
You have two UK-wide testing options:
- Clinic appointment
Attend your nearest UK clinic and provide a urine sample on site. - At-home testing (£60 extra)
Collect your urine sample at home following provided instructions, without attending a clinic.
Your sample is analysed by an accredited laboratory in line with the lab guide documentation.
Your results explained
Low urine creatinine levels
Usually indicate dilute urine, often due to high fluid intake or timing of sample collection.
Typical laboratory interpretation:
- Lower than expected concentration for a random urine sample
Normal urine creatinine levels
Suggest appropriate urine concentration and reliable sample quality.
Typical laboratory interpretation:
- Within laboratory reference interval
High urine creatinine levels
Usually reflect concentrated urine, commonly due to reduced fluid intake or dehydration.
Typical laboratory interpretation:
- Above laboratory reference interval
Exact reference ranges depend on laboratory reporting standards and sample type.
How It Works
Simple steps to get your results
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Attend one of our UK or London clinics, arrange a home nurse visit, or use a finger-prick kit where available.
Get Your Results
Your sample is analysed by accredited UK laboratories, with secure results delivered directly to you.
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WhatsApp UsHow to Prepare for Your Test
Follow these guidelines for accurate results
Sample Timing
Where possible, attend your blood test between 7am and 12pm. Please wait until any short-term illness or infection has fully resolved before testing. Avoid intense exercise for 24–48 hours beforehand, as this can affect certain markers.
Fasting & Hydration
Fasting is not always required, but some tests may recommend it. If fasting is advised, avoid food for 8–12 hours before your appointment and drink water only. Stay well hydrated, as this helps with sample collection and accuracy.
Medications & Supplements
Continue prescribed medications unless advised otherwise by your clinician. Avoid vitamin, mineral, or biotin supplements for at least 24–48 hours before your test, as these can interfere with results. If you are unsure about any medication or supplement, please let us know before your appointment.
Hormones & Menstrual Cycle
For hormone-related tests, timing within your menstrual cycle may be important. If relevant, follow any specific guidance provided on your test page.
If you have any questions or special circumstances, our team is happy to advise before your appointment.