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HelpTest Code GENRA Gentamicin, Random, Serum
Specimen Required
Collection Container/Tube:
Preferred: Serum gel
Acceptable: Red top
Submission Container/Tube: Plastic vial
Specimen Volume: 0.5 mL
Collection Instructions:
1. Serum gel tubes should be centrifuged within 2 hours of collection.
2. Red-top tubes should be centrifuged, and the serum aliquoted into a plastic vial within 2 hours of collection.
Useful For
Monitoring adequacy of serum concentration during gentamicin therapy in specimens for which no collection timing information is provided
Method Name
Turbidimetric Immunoassay
Reporting Name
Gentamicin, Random, SSpecimen Type
SerumSpecimen Minimum Volume
0.25 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum | Refrigerated (preferred) | 7 days | |
| Frozen | 14 days | ||
| Ambient | 72 hours |
Reject Due To
| Gross hemolysis | Reject |
Reference Values
Gentamicin, Peak
Therapeutic: 3.0-12.0 mcg/mL
Toxic: >12.0 mcg/mL
Gentamicin, Trough
Therapeutic: <2.0 mcg/mL
Toxic: >2.0 mcg/mL
Day(s) Performed
Monday through Sunday
Report Available
Same day/1 dayPerforming Laboratory
Mayo Clinic Laboratories in Rochester
Test Classification
This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.CPT Code Information
80170
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| GENRA | Gentamicin, Random, S | 35668-3 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| GENRA | Gentamicin, Random, S | 35668-3 |
Forms
If not ordering electronically, complete, print, and send a Therapeutics Test Request (T831) with the specimen.