Understanding Your Laboratory Test: A Patient Guide to What It Is, How It Is Done, and What Your Results Mean
This test detects the presence of acetylsalicylic acid (aspirin) in your urine, commonly used to monitor medication adherence or identify salicylate overdose.
{"Detects aspirin or salicylate drugs in urine","Helps monitor if patients took their prescribed medication","Used to diagnose aspirin/salicylate overdose","Simple urine sample collection required","Results are reported as present or absent"}
Key facts at a glance
- LOINC
- 16314-7
- Short code
- SALU
- Synonyms
- Acetylsalicylate Ur Ql
- Category
- chemistry
- Sample
- urine
- Container
- Sterile urine container (plastic or glass, graduated)
- Units
- N/A
- Critical range
- — – 50 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- ≥ 0 years
- Method
- Immunoassay (Enzyme-multiplied immunoassay technique or Lateral flow chromatographic immunoassay)
- CPT
- 80329 (Drug test(s), per specimen, immunoassay, single drug class; non-quantitative)
- SNOMED
- 41555009 (Salicylate measurement (procedure))
- Specimen volume
- 10-50 mL preferred; minimum 5 mL
- Stability
- Room temperature: 24-48 hours; Refrigerated (2-8°C): 7 days; Frozen (-20°C or below): 30 days. Store protected from light.
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 4–24 hours
- Order
- routine
This test is a laboratory analysis that helps your healthcare provider evaluate your health status, screen for certain conditions, monitor an ongoing medical issue, or check how well a treatment is working. Your provider may order it as part of a routine checkup or because of specific symptoms you have reported.
The Urine Acetylsalicylate test checks whether aspirin (also known as acetylsalicylic acid or salicylate) is present in your urine. When you take aspirin, your body metabolizes it, and some of it passes into your urine. This test can detect whether you have taken this medication recently.
The test is usually performed on a small sample collected at a clinic, hospital, or laboratory. Depending on what your provider has ordered, the sample may be a blood draw from a vein in your arm, a urine specimen, or another type of specimen such as a throat or nasal swab. The collection process is typically quick, and the sample is then sent to a laboratory for analysis.
A urine sample is collected in a sterile container. No special preparation (like fasting) is typically required. The sample is then sent to a laboratory where it is analyzed using chemical methods to detect the presence of acetylsalicylate or its metabolites.
Your results are compared with a reference range, which is the expected range for healthy individuals. Results within that range are generally considered normal, while values outside it may suggest a condition that needs further attention. Abnormal results do not always mean you are ill, so it is important to review them with your healthcare provider, who can interpret them in the context of your symptoms, medical history, and other test findings.
Results are typically reported as 'Positive' (aspirin detected) or 'Negative' (no aspirin detected). A positive result means salicylate compounds were found in your urine, indicating recent aspirin use. A negative result means no aspirin was detected, which could mean no aspirin was taken or the drug has been fully eliminated from your body.
Reference range
Negative - No acetylsalicylate detected in urine. Result reported as 'Present' or 'Not Detected'.N/A
No fasting required. Inform laboratory of any aspirin, pain reliever, or salicylate-containing medication use. Collect urine sample in clean, dry container. Avoid contamination with disinfectants or cleansers containing phenolic compounds.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test is primarily used for three purposes: (1) Medication compliance monitoring - to verify whether patients are taking their prescribed aspirin as directed, particularly important for patients on long-term aspirin therapy for heart disease or stroke prevention; (2) Overdose diagnosis - to help identify salicylate poisoning in cases of suspected overdose, as excessive aspirin can cause serious health complications; (3) Drug screening - as part of toxicology screening in emergency or clinical settings.
Frequently asked questions
Do I need to fast before this test?
How long does aspirin stay in urine?
Can foods or other substances affect the test results?
Is this test painful?
Sources
- 1MedlinePlus - SalicylateSource
- 2
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