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Serum/plasma concentration of indomethacin (active metabolite sulindac sulfone)

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of a drug metabolite in your blood, which helps monitor how well your body is processing a pain reliever or anti-inflammatory medication.

Quick summary

["This test helps track medication effectiveness and side effects over time."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
73135-6
Short code
Sulindac ind plt IgG SerPl Ql FC
Synonyms
Sulindac ind plt IgG 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 healthcare provider may order this test if you’re taking sulindac (a nonsteroidal anti-inflammatory drug, or NSAID) and want to check how your body is handling it. It can help ensure the right dose is working safely or adjust treatment if needed.

What to Expect Before the Test

No special preparation is usually required. You’ll have a small needle inserted into your arm to draw blood, similar to other routine blood tests. If you’re on blood thinners, let your provider know before the test.

What the Results Mean

Results show the concentration of sulindac’s active metabolite in your blood. High levels may indicate poor metabolism or potential side effects, while lower levels might suggest the medication isn’t being absorbed well.

Common Uses and Considerations

This test is often used in patients with kidney issues, liver problems, or those taking multiple medications to avoid interactions. It’s not a routine check but may be done during ongoing treatment for pain or inflammation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Monitoring Medication Safety

Short name

Indomethacin metabolite levels

Frequently asked questions

How often do I need this test?
The frequency depends on your treatment plan. Your provider will determine how often based on your medical history, current medications, and symptoms. Follow their guidance closely.
What are typical reference ranges?
Reference ranges vary by lab and individual factors. Your results will be compared to your own baseline or clinical guidelines specific to your condition.
Can I eat or drink before this test?
You can eat and drink normally unless instructed otherwise. Avoid alcohol or caffeine before the test, as they may affect blood composition.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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