Gentamycin Trough, Traditional

Message

Test performed by York Hospital Laboratory.

Test Code

GENTT

CPT Codes
80170

Preferred Specimen

0.2 mL serum collected in a no additive (red-top) tube, transferred to a plastic screw-cap vial

Other Acceptable Specimens

0.2 mL serum collected in a serum separator tube (SST)

Instructions

Remove the serum from the cellular material within 1 hour of collection.
Collect as a trough just before next dose.
Include time of last dose with the specimen.

Transport Temperature

Refrigerated

Specimen Stability

Room temperature: 2 hours
Refrigerated: 7 days
Frozen: 14 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Serum not removed from cells within 1 hour

Methodology
Immunoassay

Setup Schedule

Daily

Report Available

Same Day
Available STAT 1 Hour

Reference Range

<1.50 ug/mL
Detection Limit: 0.60 ug/mL

Critical Values
>3.00 ug/mL

Clinical Significance

Gentamicin is used in the treatment of serious infections caused by susceptible strains of gram-negative microorganisms and particular gram-positive organisms that are resistant to less toxic antibiotics. Gentamicin is safe and effective only in a narrow range of concentrations for a given indication. Exposure to high gentamicin concentrations for a prolonged period may cause renal impairment or ototoxicity. Serum gentamicin measurements are used in the diagnosis and treatment of gentamicin overdose and in monitoring levels of gentamicin to ensure appropriate therapy.

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.