Salicylate concentration in urine (24-hour collection)
This test measures the amount of salicylate, a compound found in aspirin and some other medications, in your urine over a 24-hour period. It helps assess how well your body is processing these medications.
["This test helps monitor salicylate levels in your urine to check for safe medication use or potential toxicity."]
Key facts at a glance
- LOINC
- 108537-2
- Short code
- Salicylates Msmt Ur
- Synonyms
- Salicylates Msmt Ur
- Category
- chemistry
- Sample
- urine
- Container
- Sterile urine container
- Units
- N/A
- Critical range
- — – 50 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
Why This Test Is Done
Your healthcare provider may order this test if you’re taking salicylate-containing medications (like aspirin) for conditions such as arthritis, fever, or pain. It may also be used to monitor long-term use, check for overdose, or evaluate kidney function related to salicate metabolism.
What to Expect Before the Test
You’ll need to collect all urine for a full 24-hour period, typically starting after a morning void. Your healthcare team will provide detailed instructions on how to properly collect and store the sample. Avoid consuming salicylate-containing products during this time unless directed otherwise.
What the Test Results Mean
Higher-than-expected levels may indicate improper medication dosing, kidney issues, or salicylate toxicity. Lower-than-expected levels might suggest poor absorption or metabolism of the medication. Your results will be interpreted in the context of your medical history and symptoms.
Common Causes of Abnormal Results
Elevated salicylate levels could be due to recent aspirin overdose, kidney problems, or excessive intake. Decreased levels might occur if you’re not taking the medication as prescribed or have certain liver or gastrointestinal conditions.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Salicylate toxicity can cause symptoms like nausea, ringing in the ears, confusion, or even severe complications like acid-base imbalances or internal bleeding. Regular monitoring is crucial for patients on long-term salicylate therapy to prevent these risks. Kidney function is also indirectly assessed since salicates are filtered by the kidneys.
Short name
24-Hour Urine Salicylate
Frequently asked questions
How long does it take to get the results?
Can I drink water during the 24-hour urine collection?
Do I need to fast before 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 17, 2026. · Read our editorial policy