Gabapentin-to-Creatinine Ratio, Urine
Measures the amount of gabapentin in urine relative to creatinine, which helps account for differences in urine concentration.
["This test helps determine how much gabapentin your body is excreting and may be used to monitor treatment or possible toxicity."]
Key facts at a glance
- LOINC
- 72811-3
- Short code
- Gabapentin/Creat Ur
- Synonyms
- Gabapentin/Creat Ur
- Category
- kidney
- Sample
- urine
- Container
- Sterile urine container
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- 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
What is this test?
This test measures gabapentin, a medicine used to treat seizures and certain nerve pain, in your urine. The result is compared with the amount of creatinine in the urine so that variations in urine concentration do not fully affect interpretation.
Why might I need this test?
Your clinician may order this test to check medication exposure, investigate whether you are taking the prescribed amount, or evaluate signs of gabapentin toxicity. It may also be used during routine monitoring of gabapentin treatment.
How is the test performed?
A urine sample is tested in the laboratory to determine the amounts of gabapentin and creatinine. The laboratory then calculates the gabapentin-to-creatinine ratio. The sample may be collected as a spot urine sample or over a specified period, depending on your clinician's instructions.
How do I prepare for the test?
Collect the urine exactly as instructed, including any specified collection period. Record the time of your last gabapentin dose and the urine collection time, and tell your clinician about other medicines you take. Do not change your gabapentin dose unless your clinician directs you to do so.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
A higher-than-expected result may reflect recent dosing, taking more than prescribed, reduced elimination, or impaired kidney function. A lower-than-expected result may indicate a missed dose, reduced intake, poor absorption, or unusually rapid elimination. Interpretation depends on the prescribed dose, timing of the sample, kidney function, and clinical symptoms.
Short name
Urine Gabapentin Ratio
Frequently asked questions
Is this the same as a standard kidney function test?
Does a high result mean gabapentin is dangerous?
Should I stop taking gabapentin before the 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