Renal Inulin Clearance (Plasma)
This test measures how well your kidneys filter waste products from your blood by tracking the clearance of inulin, a substance that mimics natural waste removal.
["Assesses kidney function by tracking waste removal efficiency."]
Key facts at a glance
- LOINC
- 92825-9
- Short code
- Renin upr Plas-aCnc
- Synonyms
- Renin upr Plas-aCnc
- Category
- chemistry
- Sample
- plasma
- Container
- Lavender-top (EDTA) or Green-top (Heparin)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
What Is Inulin Clearance Used For?
Inulin clearance helps evaluate how effectively your kidneys filter blood, which is critical for diagnosing and monitoring kidney disease, including chronic kidney disease (CKD) or glomerular disorders. It’s often used alongside other kidney function tests to get a fuller picture of kidney health.
How Is This Test Performed?
You’ll receive a small injection of inulin, a harmless sugar-like substance, and then provide blood and urine samples at timed intervals. The test measures how quickly the substance appears in your urine, indicating how well your kidneys are filtering blood.
Why Might You Need This Test?
Doctors may order inulin clearance if they suspect kidney disease, monitor kidney function in patients with diabetes or high blood pressure, or assess kidney damage from conditions like lupus or glomerulonephritis.
What Does the Test Result Mean?
Results are typically expressed in milliliters per minute (mL/min). Lower than expected clearance may signal impaired kidney function, while higher clearance could indicate overactive kidney filtration (rare). Always discuss results with your healthcare provider.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance: Inulin clearance is a gold-standard test for measuring glomerular filtration rate (GFR), the primary indicator of kidney function. It helps identify early kidney damage by measuring how efficiently waste products are filtered from blood, which is essential for diagnosing and managing chronic kidney disease, hypertension-related kidney damage, or other glomerular disorders.
Short name
Inulin Clearance
Frequently asked questions
Why do I need this test?
How long does the test take?
Is there any risk or discomfort?
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