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Gentamicin Serum Concentration (High-Potency Form)

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

This test measures the amount of gentamicin, a strong antibiotic, in your blood serum. It helps doctors monitor how well your body is handling this medication.

Quick summary

["This test ensures your antibiotic dose stays safe and effective."]

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

Key facts at a glance

LOINC
7018-5
Short code
Gentamicin Islt MIC high potency
Synonyms
Gentamicin Islt MIC high potency
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
mic-high-potency
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 Is This Test Done?

Your doctor may order this test if you’re taking gentamicin to treat serious infections, such as bloodstream infections, kidney infections, or severe bone/joint infections. It helps prevent side effects like kidney damage or hearing loss by ensuring the antibiotic stays within safe levels.

What Does the Test Measure?

The test checks the concentration of gentamicin in your blood serum. Gentamicin is a broad-spectrum antibiotic used to fight bacterial infections, but high levels can be harmful. This test helps balance effectiveness and safety.

How Is the Sample Collected?

A blood sample will be drawn from a vein, usually in your arm. The sample is sent to a lab for analysis.

What Do Results Mean?

Results are typically reported in micrograms per milliliter (mcg/mL). Your doctor will interpret these results based on your medical condition, medication dose, and other factors.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Gentamicin Level (Serum)

Frequently asked questions

What causes a doctor to order this test?
Your doctor may order this test if you’re prescribed gentamicin for a serious infection, especially if you have kidney issues or are taking other medications that interact with it.
How often should I expect this test?
The frequency depends on your treatment plan. Your doctor may order it weekly or more often during high-dose therapy or if you have kidney problems.
Can I eat or drink before the test?
You can eat and drink normally unless your doctor specifies otherwise. Avoiding food/drink may not apply to this test, as it’s a blood draw.
  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