Gentamicin | KK Women's and Children's Hospital

Specimen Container	Gel separator tube (Adult) Microtube (Paeds)
Specimen Requirement	Plain Blood Adult: 3 mL Paediatric: 1.3 mL Trough level- collect specimen just before the next dose. Peak level - collect specimen 1 hr after start of IV dose or 1hr after IM dose. For OD dosing: Single level: collect 6-14hr after last dose. Trough level: collect 18-24hr after last dose. Peak level: collect sample 1 hr after start of IV dose. Invert blood 5 times after blood collection ensures the clot-activating factors is well mixed with the blood. This will ensure results are reliable..
Orderable as Urgent?	Yes
Turn Around Time	Average 3 hrs ( 2 - 4 hrs)
Reference Value(s)	Trough: <2 mg/L Peak: 5–10 mg/L
Testing Laboratory Location	KKH
Laboratory	Clinical Chemistry
Contact Number	6394 1383
Day and Time Performed	Clinical Chemistry
Orderable on CPOE?	Yes
Downtime Form	Clinical Chemistry - Form A
Additional Information	Critical Values: Pre-Gentamicin: >3 mg/L (High) Post-Gentamicin: >12 mg/L (High)

Change History Notes

Last Updated - 19 Jun 2025