Gentamicin, Trough, Plasma or Serum

Test Code

Gent Trough/GENTT -NOCO

CPT Codes
80170

Preferred Specimen

1 mL plasma from Green top (Lithium Heparin)

Minimum Volume

0.5 mL

Other Acceptable Specimens

1 ml serum from Serum Gel or Red Top

Instructions

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

Temperature	Time
Refrigerated	5 days

Methodology

Setup Schedule

Monday through Sunday; Continuously

Report Available

Same day

Reference Range

Refer to the Chemistry Reference Range and Critical Results documents in the Resources file on the facility test directory page.

Performing Laboratory
North Colorado Medical Center Laboratory

Last Updated: August 13, 2026

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.