Tobramycin Level, Plasma or Serum

Test Code

CPT Codes

Preferred Specimen
Submit only 1 of the following specimens:


Draw blood in a green-top (lithium heparin) tube or a
lavender-top (EDTA) tube. Spin specimen down and send 0.5 mL
of plasma.

Note: 1. Indicate plasma.

2. Label specimen appropriately (plasma).


Draw blood in a plain, red-top tube. Spin specimen down and send
0.5 mL of serum.

Note: 1. Indicate serum.

2. Label specimen appropriately (serum).

Transport Temperature
Refrigerate up to 7 days/Frozen OK 

Enzyme Immunoassay (EIA)
Note: Refer to Therapeutic Drug Monitoring (TDM) Recommended Collection Times for Peak/Trough Levels located in General Information.

Setup Schedule
Monday through Sunday

Reference Range

Trough: <2.0 µg/mL

Peak: >5.0-10 µg/mL

Critical values

Trough: ≥2.0 µ/mL

Peak: >10 µg/mL

Performed By
North Mississippi Medical Center Pathology Department

Performing Laboratory
NMMC Pathology Department

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.