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Serum Gentamicin Peak Concentration (Mass Concentration)

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

This test measures the highest amount of gentamicin (an antibiotic) in your blood right after it is given. It helps doctors monitor how well your body is handling the 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
3663-2
Short code
Gentamicin Peak SerPl-mCnc
Synonyms
Gentamicin Peak SerPl-mCnc
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, often for serious bacterial infections like sepsis or kidney infections. It helps prevent side effects like kidney damage by ensuring the antibiotic levels stay within safe ranges.

What to Expect Before the Test

No special preparation is needed. A healthcare provider will draw blood from a vein in your arm. You may feel a small pinch, but it usually doesn’t cause discomfort.

What the Results Mean

Results help doctors adjust your medication if needed. Low levels may mean the antibiotic isn’t working well, while very high levels could indicate kidney issues or toxicity. Always discuss results with your provider.

Common Questions About This Test

Is this test painful? The blood draw is quick but may cause mild discomfort. You can ask your provider about pain relief if needed.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Gentamicin Peak Level

Frequently asked questions

Can I eat or drink before this test?
Yes, you can eat and drink normally unless your provider gives specific instructions. This test only requires a blood sample.
What if I have kidney problems?
If you have kidney issues, this test is especially important. Your doctor may adjust your dose to avoid harm while keeping the antibiotic effective.
Does this test affect my antibiotic treatment?
No, this test is just a monitoring tool. It helps your doctor balance safety and effectiveness of your medication.
  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