Naproxen concentration in plasma
This test measures the amount of naproxen, a nonsteroidal anti-inflammatory drug (NSAID), in your blood plasma. It helps your healthcare provider assess drug levels to ensure safe and effective dosing.
["This test helps monitor how much naproxen is in your system for proper treatment and safety."]
Key facts at a glance
- LOINC
- 73248-7
- Short code
- Naproxen ind plt IgM SerPl Ql FC
- Synonyms
- Naproxen ind plt IgM SerPl Ql FC
- Category
- hematology
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- flow-cytometry
- CPT
- 82784
- 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
Why This Test Is Done
Your doctor may order this test if you’re taking naproxen (a medication like Aleve® or Naprosyn®) for conditions like arthritis, pain, or inflammation. It helps ensure your dose is appropriate and avoids potential side effects, such as stomach irritation or kidney issues.
What to Expect Before the Test
No special preparation is needed. You’ll have a small needle inserted into your vein or arm for a blood draw. The process is quick and usually painless. If you’re on blood thinners or have a history of bleeding disorders, let your doctor know before the test.
What the Results Mean
Results show the concentration of naproxen in your plasma. While reference ranges vary by lab and medication form, your doctor will compare your result to your specific dose and health status to guide treatment. Abnormally high levels may indicate overdose or poor metabolism, while low levels might suggest insufficient absorption.
Potential Side Effects or Considerations
Naproxen is generally safe when taken as directed, but high levels in the blood can increase risks like stomach bleeding, kidney problems, or dizziness. If you experience nausea, vomiting, or unusual fatigue after taking naproxen, report it to your doctor.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Monitoring naproxen levels is critical for patients with kidney disease, liver issues, or those taking other medications that interact with NSAIDs. It also helps adjust doses in children, elderly patients, or those with reduced kidney function to prevent toxicity or underdosing.
Short name
Naproxen Level
Frequently asked questions
How often should I get this test?
What happens if my naproxen level is too high?
Can I drink alcohol while taking naproxen?
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