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Test Code 535 Gentamicin, Random

Additional Codes


PowerChart: Gentamicin Random Level


Specimen Requirement

0.5 mL of serum or plasma is required for testing.

Additional Specimen Collection Information

Collect blood in a lithium heparin green-top or red-top tube. Serum and plasma gel tubes are not acceptable. Lipemic samples > 4+ turbidity must be cleared prior to analysis. It is recommended that the serum or plasma be separated from contact with cells within 2 hours from time of collection. Serum or plasma should be stored refrigerated if assays are not completed within 8 hours. If assays are not completed within 48 hours, freeze the sample.

Useful For

Monitoring adequacy of serum concentration during gentamicin therapy


Testing is performed Monday through Sunday.

Routine: Typically completed within 4 hours after the specimen arrives at the testing site.

Expedite: Typically completed within 2 hours after the specimen arrives at the testing site.

STAT: Typically completed within 1 hour after the specimen arrives at the testing site.

CPT Code Information

80170 Therapeutic Drug Levels; Gentamicin, peak

LOINC Code Information

35668-3 Gentamicin [Mass/Volume] In Serum Or Plasma

Test Method

Turbidimetric Inhibition Immunoassay; Beckman DXC880i

Reference Values

Not established; results are subject to interpretation by the clinician.