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Gentamicin Quantitative Serum Concentration

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

This test measures the amount of gentamicin, a medication used to treat serious bacterial infections, in your blood serum.

Quick summary

["Gentamicin levels help ensure safe dosing and monitor for potential side effects."]

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

Key facts at a glance

LOINC
7016-9
Short code
Gentamicin Islt Grad strip
Synonyms
Gentamicin Islt Grad strip
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
gradient-strip
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

Your healthcare provider may order this test if you’re taking gentamicin to treat infections like sepsis, pneumonia, or urinary tract infections. It helps determine whether the medication is working effectively and at a safe level in your body.

How the Test Works

A blood sample is drawn, and the gentamicin in your serum is measured using a sensitive laboratory method. This helps track how much of the drug is present over time.

What to Expect Before the Test

No special preparation is needed, but inform your provider if you’re taking other medications or have allergies. Avoid eating or drinking for 8–12 hours before testing if instructed.

What to Expect During the Test

A healthcare professional will insert a needle into your vein to draw blood. You may feel a brief pinch, but it usually doesn’t cause discomfort. The process takes only a few minutes.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Gentamicin Level

Frequently asked questions

How long does it take to get results?
Results are typically available within 24–48 hours, depending on lab processing times. Your provider will discuss them with you during your follow-up visit.
What do my results mean?
Your results will be compared to your provider’s target range for your specific situation. If levels are too high or too low, adjustments to your medication may be needed.
Can I eat or drink before this test?
Check with your provider first, as some tests require fasting. Generally, avoid food/drink for 8–12 hours before drawing blood unless instructed otherwise.
  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