Skip to content

Sulfonamide drug concentration in urine (24-hour collection)

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

This test measures the amount of sulfonamide antibiotics present in your urine over a 24-hour period. It helps assess how well your body is processing these medications.

Quick summary

["This test helps doctors monitor antibiotic levels in your urine to ensure proper dosing and avoid side effects."]

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

Key facts at a glance

LOINC
5812-3
Short code
Sulfonamide cry UrnS Ql Micro
Synonyms
Sulfonamide cry UrnS Ql Micro
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
microscopy-light
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 sulfonamide antibiotics (like sulfamethoxazole/trimethoprim) and want to check how your body is handling them. It’s particularly useful for patients with kidney issues or those needing dose adjustments.

What to Expect Before the Test

You’ll need to collect all urine for 24 hours in a special container. Drink plenty of fluids to help urine flow, but avoid adding preservatives. Follow your provider’s instructions carefully to ensure accurate results.

How the Test Works

Urine is tested for sulfonamide antibiotics using a sensitive laboratory method to measure their concentration. The test detects the presence of these drugs in your urine, which helps track their effectiveness and safety.

Possible Results and Interpretation

Results are typically reported as a concentration range (e.g., micrograms per milliliter). High levels may indicate poor absorption or kidney issues, while low levels could mean the medication isn’t working as expected. Your provider will discuss these findings with you.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Sulfamethoxazole/Urine (24-hour)

Frequently asked questions

How long does it take to get my results?
Results are usually available within 1–3 business days after the lab processes your urine sample.
Can I drink alcohol before this test?
No, avoid alcohol for 24 hours before your urine collection, as it may interfere with test accuracy.
What if I miss my urine collection time?
If you miss the 24-hour window, your provider may need to reschedule the test to ensure accurate results.
  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