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Gentamicin (Serum/Plasma Concentration)

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

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

Quick summary

["Gentamicin levels help ensure safe dosing and avoid potential kidney damage."]

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

Key facts at a glance

LOINC
73364-2
Short code
Gentamicin ind plt IgM SerPl Ql FC
Synonyms
Gentamicin ind plt IgM SerPl Ql FC
Category
hematology
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
flow-cytometry
CPT
82784
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 taking gentamicin to treat serious bacterial infections. It helps track how much of the drug is in your blood to prevent side effects like hearing loss or kidney problems.

What to Expect Before the Test

No special preparation is needed. A healthcare professional will draw blood from a vein in your arm. The process is quick and usually painless.

What the Results Mean

Results help determine if your dose of gentamicin is appropriate. Too much can harm your kidneys or nerves, while too little may not fight infections effectively.

Common Uses and Risks

This test is used primarily to manage antibiotic therapy and avoid overdoses. Risks include mild discomfort at the injection site or, rarely, allergic reactions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Gentamicin levels are critical for patients with kidney issues or those receiving high doses. Abnormal results may prompt dose adjustments or further monitoring.

Short name

Gentamicin Level

Frequently asked questions

Why do I need this test while on gentamicin?
Your doctor needs to check your blood levels to prevent side effects like kidney damage or hearing loss. It ensures the drug stays effective against infections.
What do my results indicate?
If levels are too high, your doctor may lower your dose or switch medications. If levels are too low, they might increase your dose or check for infection resistance.
Can I eat or drink before this test?
You can eat and drink normally unless instructed otherwise. This test only requires a blood draw, so no fasting is needed.
  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