Gentamicin, Peak

Tube Type = Royal Blue and Red Bullet

no gel in red top bullet

Tube Type

Test ID LAB28
EPIC Order
 GENTAMICIN LEVEL, PEAK
CPT Code(s) 80170
Group/Individual Test Individual
Laboratory Core Laboratory
Tube Station Routine: 30; STAT: 888
Specimen Routine: 2 mL blood/navy blue plain tube or red plain tube; See Comments 
Micro: 300 µL blood/red plain pediatric bullet; See Comments 
Stability  
Unspun: 2 hours
Spun/Separated, Room temperature: 8 hours
Spun/Separated, Refrigerator: 2 days
Spun/Separated, Frozen: 30 days
Availability 24 hrs/day
Turnaround Time STAT: 1 hr; Routine: 2 hrs
Reference Range Therapeutic: 4-10 mcg/mL (Peak)
Toxic: >12.0 mcg/mL (Peak)
Comment
  • Red top tubes WITHOUT Serum Separator Gel
  • Collection for gentamicin peak samples:
    • IV infusion: 30-60 min after completion
    • IM injection: 60-90 min post dosing
  • Collect sample before administering B-lactam antibiotics otherwise levels may be lower than expected.
  • Go to Trough Information.

Reviewed by J. Carr on January 05, 2026

UNC Hospitals
McLendon Clinical Laboratories
101 Manning Drive
Chapel Hill, NC 27514