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Tobramycin Peak Concentration in Serum

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

This test measures the highest amount of the antibiotic tobramycin in your blood serum after it has been administered. Tobramycin is used to treat serious bacterial infections.

Quick summary

["Your peak tobramycin level helps doctors monitor how well your body is responding to this antibiotic and ensures safe dosing."]

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

Key facts at a glance

LOINC
22751-2
Short code
Tobramycin Peak SerPl-sCnc
Synonyms
Tobramycin 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 This Test Is Done

Doctors may order this test if you’re receiving intravenous tobramycin therapy for infections like pneumonia, urinary tract infections, or bloodstream infections. It helps track how much of the drug is in your blood at its highest point after dosing to prevent toxicity while ensuring effectiveness.

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted into a vein (usually in your arm) to draw blood. The process takes about 5 minutes, and you may feel a brief pinch. Rest assured, this is a standard blood draw procedure.

How the Test Results Are Used

Your peak tobramycin level helps doctors determine if your dose is too high (which could cause side effects like kidney damage) or too low (which might mean the infection isn’t being fully treated). They’ll compare your results to guidelines to adjust your treatment plan if needed.

Possible Side Effects or Risks

While rare, very high levels of tobramycin can affect your kidneys or nerves. Your doctor will carefully monitor your results to avoid these risks. Most people tolerate the test and treatment well when done under medical supervision.

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 high peak level mean?
A high peak level may indicate your body isn’t processing the drug efficiently, which could lead to side effects. Your doctor may adjust your dosing schedule or monitor you more closely to prevent harm.
What does a low peak level mean?
A low peak level might mean the infection isn’t being fully treated. Your doctor may increase your dose or check for other factors that could be affecting how well the drug works in your body.
How often will I need this test?
The frequency depends on your treatment plan. Your doctor will schedule follow-up tests based on how your infection responds and your overall health. Typically, these tests are done during active treatment phases.
  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