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Test Code GENPK Gentamicin, Peak

Specimen Type



Red top

Preferred Volume

4 mL

UCMC Collection Instructions

Recommended that serum for a peak level should be drawn 1 hour after completion of infusion of an intravenous dose or 2 hours after an intramuscular or oral dose of gentamicin. 
Consult adult or pediatric dosing services for additional information.



Turnaround Time

3 hours

STAT Availability

Not Available

Test Usage

Measurements are used as an aid in the diagnosis and treatment of gentamicin overdose and in monitoring levels of gentamicin to ensure proper therapy.

Test Methodology

cloned enzyme donor immunoassay (CEDIA)

Additional Information

(Trough level:  30 min before next dose)

CPT Code


Test Includes

quantitative determination of peak gentamicin in serum

Critical Results

>10 µg/mL

Test Limitations

Sisomicin shows significant interference (> 50 %) with this assay.

Reference Range

therapeutic range:
Adults: peak: 5 – 9 µg/mL

Minimum Volume

2 mL

Fee Code