Skip to content

Tobramycin in Urine Mass Concentration

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

This test measures the amount of the antibiotic tobramycin found in your urine, which helps doctors assess how well your body is processing this medication.

Quick summary

["Tobramycin levels in urine help monitor kidney function and drug effectiveness during treatment."]

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

Key facts at a glance

LOINC
17808-7
Short code
Tobramycin Ur-mCnc
Synonyms
Tobramycin Ur-mCnc
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
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 Is This Test Done?

Your healthcare provider may order this test if you’re receiving tobramycin (an antibiotic) to check for kidney problems or to ensure the drug is working properly. It’s especially important if you have a kidney condition or are taking other medications that could affect kidney function.

What to Expect Before the Test

No special preparation is needed, but you may be asked to collect a urine sample in a clean container at home or during a clinic visit. Follow your provider’s instructions carefully to ensure accurate results.

What the Results Mean

Higher than expected levels might indicate kidney issues or improper drug metabolism, while lower levels could suggest the drug isn’t being absorbed well. Your results will be reviewed by your doctor to guide treatment decisions.

Common Reasons for Testing

Doctors may test for tobramycin in urine if you have a urinary tract infection (UTI) treated with this antibiotic, kidney disease, or if you’re taking other medications that could interact with tobramycin.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Monitoring urine tobramycin levels helps prevent toxicity (e.g., kidney damage) and ensures the antibiotic is effective. Abnormal results may prompt adjustments to your medication, hydration, or further medical evaluation.

Short name

Urine Tobramycin Level

Frequently asked questions

Why might my urine tobramycin test be ordered?
Your doctor may order this test if you’re receiving tobramycin for an infection, have kidney concerns, or are taking other medications that could affect kidney function.
What do my results mean?
Results help assess kidney function and drug effectiveness. High levels may signal kidney issues or improper drug handling, while low levels might indicate poor absorption. Your doctor will interpret these with your full medical picture.
Can I drink water before the test?
Yes, but avoid excessive fluid intake just before testing to ensure a representative sample. Follow your provider’s specific instructions for timing.
  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