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Urinary Gentamicin Concentration (Mass Concentration)

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

This test measures the amount of the antibiotic gentamicin found in your urine. It helps doctors monitor how well your body is clearing this medication from your system after treatment.

Quick summary

["This test helps track how your kidneys process gentamicin, ensuring safe dosing for infection control."]

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

Key facts at a glance

LOINC
85807-6
Short code
MuV Gentyp Spec
Synonyms
MuV Gentyp Spec
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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

Doctors may order this test if you’re receiving gentamicin therapy to treat serious bacterial infections. It helps prevent kidney damage by ensuring the drug stays within safe levels in your body.

How the Test Works

A urine sample is collected, typically after you’ve been on gentamicin for a few days. The lab measures how much gentamicin remains in your urine, which reflects how your kidneys are processing the drug.

What to Expect Before the Test

No special preparation is needed, but you may be asked to collect a midstream urine sample (clean-catch) or provide a timed urine sample (e.g., over 24 hours). Follow your doctor’s instructions carefully.

Possible Results and Interpretation

Results are compared to your individual baseline or treatment goals, not a fixed reference range. High levels may indicate kidney issues or improper dosing, while low levels could suggest the drug isn’t working effectively.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Monitoring urinary gentamicin levels is critical for patients on gentamicin to avoid toxicity (e.g., kidney damage) or insufficient infection control. It ensures the drug is cleared safely through urine, balancing effectiveness and safety.

Short name

Gentamicin in Urine

Frequently asked questions

What does a high urinary gentamicin level mean?
A high level may signal that your kidneys are struggling to process the drug efficiently, which could lead to side effects like kidney damage or hearing loss. Your doctor may adjust your dose or monitor you more closely.
Can I drink water before this test?
Yes, but avoid excessive fluid intake just before collecting the sample unless instructed otherwise. Drinking water helps dilute urine for accurate measurement, but too much may dilute the results.
Is this test painful or uncomfortable?
No, this is a simple urine test. You may feel mild discomfort during urination if collecting a clean-catch sample, but it’s not painful. If you’re using a timed urine collection, you’ll need to empty your bladder at specific times.
  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