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HelpTest Code GENRA Gentamicin, Random, Serum
Useful For
Monitoring adequacy of serum concentration during gentamicin therapy in specimens for which no collection timing information is provided
Reporting Name
Gentamicin, Random, SSpecimen Type
SerumSpecimen 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.
Specimen Minimum Volume
0.25 mL
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| 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 daySpecimen Retention Time
1 weekPerforming Laboratory
Mayo Clinic Laboratories in Rochester
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.