Quick highlights
- Timed urine-based estimate of kidney filtration
- Requires 24-hour urine collection plus blood creatinine
- Accuracy depends on complete collection and correct timing
- Often used in selected clinical scenarios where clearance is requested
- Maintain usual diet/hydration unless advised otherwise
- Not a substitute for clinical evaluation; interpret with eGFR and urine protein
- Home pickup possible for urine container (service-area dependent) and home blood draw may be available
- Clear step-by-step collection guidance improves accuracy
- SEO coverage: creatinine clearance test, 24 hour urine kidney test, kidney filtration clearance
What’s included
Preparation
- Get a large 24-hour collection container from lab
- Choose a start time; discard first urine at start time and note the time
- Collect all urine for the next 24 hours including the final sample at end time
- Keep container cool as instructed during collection
- Avoid missing any urine; missed samples reduce accuracy
- Return container promptly after completion
- Provide blood sample for serum creatinine as scheduled
- Download report from <a href='/my-account/'>View reports</a>
FAQs
A calculation estimating kidney filtration using timed urine creatinine and blood creatinine.
Yes, typically; accurate collection is crucial for reliable results.
No.
Missing urine can significantly affect results; try to collect all urine for 24 hours.
Discard the first urine at the start time, then collect all urine for the next 24 hours including the final sample at the end time.
Usually no; follow clinician advice if specific instructions are provided.
Yes, serum creatinine is usually required to calculate clearance.
Often 2–3 days depending on processing.
Urine pickup may be available after collection; blood draw may be home-collectable in many areas.
eGFR is commonly used; clearance may add value in selected contexts. Your clinician decides which is appropriate.
Incomplete collection, timing errors, high meat intake, muscle mass, and certain medicines.
Download from <a href='/my-account/'>View reports</a>.
Blood creatinine/eGFR, urine protein, urine microalbumin, electrolytes.
Discuss with your clinician; further evaluation depends on clinical context.
Notes
Accurate urine collection is essential for valid results.
