Glucose and Creatinine Ratio (Serum)
This test measures the ratio of glucose to creatinine in your blood serum, often used to assess how well your kidneys are filtering glucose from your blood.
["Helps evaluate kidney function and potential glucose metabolism issues."]
Key facts at a glance
- LOINC
- 34312-9
- Short code
- Glucose/Creat Ur-sRto
- Synonyms
- Glucose/Creat Ur-sRto
- Category
- glucose
- Sample
- urine
- Container
- Sterile urine container
- Units
- N/A
- Ref low
- 70
- Ref high
- 100
- Critical range
- 50 N/A – 400 N/A
- Fasting
- true
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 82947
- SNOMED
- 260395008
- 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
Why This Test Is Done
Your healthcare provider may order this test if you have symptoms like frequent urination, excessive thirst, or unexplained weight changes. It can also be part of routine checks for conditions like diabetes or kidney disease. Sometimes, it’s used to monitor how well medications are working or to screen for metabolic disorders.
What to Expect Before the Test
No special preparation is usually needed, but you may be asked to fast for a few hours before the blood draw if glucose levels are being specifically measured. Wear a loose shirt for easy access to your arm. Avoid strenuous activity before the test.
What Happens During the Test
A healthcare professional will insert a small needle into your arm to draw a blood sample. This usually takes just a few minutes. You may feel a slight pinch, but it’s over quickly. The blood is then sent to a lab for analysis.
What the Results Mean
The ratio itself isn’t a standalone diagnostic test, but it can help identify patterns. For example, a high ratio might suggest diabetes or kidney issues, while a low ratio could raise questions about how well your kidneys are filtering glucose. Your results will be interpreted by your provider in the context of your overall health.
Reference range
Fasting: 70-100 mg/dLN/A
Fasting for 8-12 hours required. Water is permitted. Avoid chewing gum and smoking before the test.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This ratio can indirectly reflect kidney function and glucose metabolism. Elevated glucose levels in urine (glycosuria) may indicate diabetes or impaired kidney function, while creatinine levels can indicate kidney damage. Your provider will use these results alongside other tests and symptoms to guide diagnosis or treatment planning.
Short name
Glucose-to-Creatinine Ratio (Serum)
Frequently asked questions
What does a high glucose-to-creatinine ratio mean?
Can this test detect kidney disease?
Do I need to fast for this test?
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