Gentamicin, Trough, Plasma or Serum

Test Code
Gent Trough/GENTT - NOCO

CPT Codes

Preferred Specimen
1 mL plasma from Green top (Lithium Heparin)

Minimum Volume
0.5 mL
Note: For neonate requirements see Neonate Minimum Blood Volumes

Other Acceptable Specimens
1 ml serum from Serum Gel or Red Top

  • Specimen for a peak level should be drawn 30 minutes after completion of infusion of an intravenous dose or 60 to 90 minutes after an intramuscular dose of gentamicin.
  • Indicate exact time drug was started, exact time infusion was completed in label comments (i.e. IV 1200 /1230).  If the drug will be administered by intramuscular injection, indicate time of injection in label comments (i.e. IM 1300).

Specimen Stability
Specimen Type Temperature Time
Plasma Li Hep Refrigerated 48 hours
Serum SST Refrigerated 48 hours
Red Top – Separated* Refrigerated 48 hours
*Centrifuge and aliquot into a plastic vial.

Turbidimetric Rate

Setup Schedule
Monday through Sunday; Continuously

Report Available
Same day

Reference Range
1.0-2.0 µg/mL

Performing Laboratory
Mckee Medical Center Laboratory
North Colorado Medical Center Laboratory
Sterling Regional Medical Center

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.