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Test Code 532 Gentamicin, Trough

Additional Codes


PowerChart: Gentamicin Trough Level

MA Cerner: Gentamicin, Trough - Wel

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

LOINC Code Information

3665-7 Gentamicin [Mass/Volume] In Serum Or Plasma-Trough

Test Method

Turbidimetric Inhibition Immunoassay; Beckman DXC880i

Reference Values

<2 mcg/mL

  • Toxic Level: >2 mcg/mL
  • The effective therapeutic concentration for pediatric patients may be higher than adults.