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Serum Gentamicin Peak Concentration

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

This test measures the highest amount of the antibiotic gentamicin in your blood serum after it has been fully absorbed into your system.

Quick summary

["Gentamicin levels help ensure safe dosing for infection treatment."]

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

Key facts at a glance

LOINC
22746-2
Short code
Gentamicin Peak SerPl-sCnc
Synonyms
Gentamicin Peak SerPl-sCnc
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 Is This Test Done?

Your healthcare provider may order this test if you’re receiving gentamicin therapy to treat serious bacterial infections. It helps monitor whether your dose is effective and avoids potential harm from too much medication.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm or vein to draw a blood sample. It usually takes a few minutes, and you may feel a brief pinch.

What the Results Mean

Results help determine if your gentamicin dose is within safe limits. Abnormally high levels may indicate overdose risk, while low levels could mean the infection isn’t fully treated. Your provider will discuss these findings with you.

Common Causes of Abnormal Results

High levels may occur if you’ve taken too much gentamicin or if your kidneys aren’t filtering it properly. Low levels might suggest insufficient medication or poor absorption. Kidney function and infection response also play a role.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is critical for managing gentamicin therapy to balance effectiveness and safety, especially in patients with kidney issues or certain infections.

Short name

Peak Gentamicin Level

Frequently asked questions

Why do I need this test if I’m already on gentamicin?
Regular monitoring ensures your dose stays safe and effective. Gentamicin can build up in your body if not properly managed, which can cause serious side effects like kidney damage.
Will I feel any side effects from the blood draw?
Most people experience only mild discomfort or bruising at the injection site. Rarely, there may be a slight swelling or redness.
How often will I need this test?
Your provider will schedule follow-up tests based on your treatment plan, infection response, and kidney function—typically every few days during active therapy.
  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