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Test Code GENTP Gentamicin, Peak LAB28

Test Method

Turbidimetric Inhibition Immunoassay; Beckman DXC600


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.

Useful For

Monitoring adequacy of serum concentration during gentamicin

Specimen Requirement

0.5 mL of serum or plasma is required for testing.

CPT Code Information

80170 Therapeutic Drug Levels; Gentamicin, peak

Reference Values

5-10 mcg/mL

  • Toxic Level: >12 mcg/mL

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

LOINC Code Information

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

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.