Tobramycin, Trough

Tube Type

Test ID		LAB38
EPIC Order		TOBRAMYCIN LEVEL, TROUGH
CPT Code(s)		80200
Group/Individual Test		Individual
Laboratory		Core Laboratory
Tube Station		Routine: 30 STAT: 888
Specimen	Routine:	2 mL blood/navy blue plain tube/red plain tube also acceptable; See Comments
	Micro:	300 µL blood/red plain (no gel) bullet; See Comments for additional information
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 hour; Routine: 2 hours
Reference Range	Therapeutic:	<2 µg/mL (Trough)
	Toxic:	>2.5 µg/mL (Trough)
Comments		Collect tobramycin-trough samples within 30 minutes before administering dose. Red top tubes must NOT contain Serum Separator Gel

Reviewed by J. Carr on January 09, 2026

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