Gentamicin

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Testing Laboratory

Auckland Te Toka Tumai | Auckland Hospital

Department

Chemical Pathology

Delphic Registration Code (Alpha Code)

GENT

Test Code (Numeric Code)

0891

Laboratory Handling

Phlebotomy

To prevent possible delays requesting clinician please phone 22118 if sample sent to the laboratory out of hours.

Registration

Alpha Code:GENT, Numeric Code:0891 Registration code for TROUGH levels, Alpha Code:GENP, Numeric Code:0892 Registration code for PEAK levels, Alpha Code:GENR, Numeric Code:0893 Registration code for RANDOM levels

Separating

Please notify Automation staff if a sample arrives out of hours

Sample Stability

1 week at 2-8°C, 4 weeks at -20°C

Synonyms

Gentamicin Trough, Gentamicin Peak

Turnaround Time

3 hours

Specimen Type

  • Plasma
  • Serum

Specimen Requirements

Tube/Container Type:

Preferred
  • Lithium Heparin PST- Gel (Light Green Cap)
Acceptable
  • Lithium Heparin - Non-gel (Green Cap)
  • Plain (Red Top)
  • SST II (Gold Cap)

Paediatric Specimen Requirements

Tube/Container Type:

Preferred
  • Heparin (Microtainer)
Acceptable
  • Plain(Microtainer)
  • SST(Microtainer)

Pre-testing Requirements

Sample collection times:
Random Concentration for Area Under the Curve (AUC) monitoring

Preferred

2 -8 hours after the end of infusion
Record time the blood was taken

Trough
For neonates or if AUC monitoring not available

30 minutes before next dose

Peak
-
Following I.V. bolus : 15 minutes post dose.
Following I.V. infusion : 1 hour after commencement of infusion.
Following I.M. injection : 1 hour post dose.
Peak levels not required for once daily dosing under normal circumstances.
To prevent possible delays requesting clinician please phone 22118 if sample sent to the laboratory out of hours.

Additional Specimen Information

4.5 mL PST Blood (Preferred)
Micro-PST 0.5 mL Paediatric Micro-PST Blood (Preferred)
Heparin 5 mL Heparin Blood
Plain 4 mL Plain Blood
SST 3.5 mL SST Blood
Microsample 0.5 mL Paediatric Microsample Blood
Micro-heparin 0.6 mL Paediatric Micro-heparin Blood
Micro-SST 0.5 mL Paediatric Micro-SST

Last updated: 30/03/2026