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Tobramycin Peak Concentration in Serum/Plasma

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

This test measures the highest amount of the antibiotic tobramycin in your blood right after you receive an injection. It helps doctors monitor how well your body is responding to this medication.

Quick summary

["This test helps ensure your antibiotic dose is safe and effective."]

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

Key facts at a glance

LOINC
4057-6
Short code
Tobramycin Peak SerPl-mCnc
Synonyms
Tobramycin 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 tobramycin, often for serious infections like pneumonia, sepsis, or certain types of bacterial infections. It helps them adjust your treatment to avoid side effects while keeping the infection under control.

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 blood. It usually takes a few minutes. If you’re on a drip, your doctor may collect the sample from your IV line.

What the Test Results Mean

Results are used to guide your treatment plan. High levels may indicate your body isn’t processing the drug well, while lower levels might mean you need more. Your doctor will discuss these results with you.

Possible Side Effects of Tobramycin

Tobramycin can cause side effects like nausea, kidney problems, or hearing changes. Your doctor will monitor your levels closely to minimize risks.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Tobramycin Peak Level

Frequently asked questions

What does a ‘peak’ level mean in this test?
A peak level is the highest concentration of tobramycin in your blood right after you receive the dose. It helps doctors check if the drug is working at the right time.
How often will I need this test?
Your doctor will decide how often you need this test based on your treatment plan, infection type, and response to the drug. It may be done weekly or less frequently.
Can I eat or drink before this test?
You can eat and drink normally unless your doctor instructs otherwise. No fasting is required for this test.
  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