Sign in →

Test Code GENTP Gentamicin, Peak LAB28

Test Method

Turbidimetric Inhibition Immunoassay; Beckman DXC600

Specimen Requirement

0.5 mL of serum or plasma is required for testing.

Reference Values

5-10 mcg/mL

  • Toxic Level: >12 mcg/mL

  • The effective therapeutic concentration for pediatric patients
    may be higher than adults.


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

3663-2 Gentamicin [Mass/Volume] In Serum Or Plasma-Peak

Useful For

Monitoring adequacy of serum concentration during gentamicin

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.