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Gentamicin

Source Blood
Mnemonic Pre-dose   GEN1
Post-dose GEN2
Random    GENR
Specimen Requirements

1 x 3 mL or 4.5 mL light green (mint) top PST tube.  Gold top SST tube also acceptable.

0.2 mL plasma or serum

Minimum Whole Blood Volumes for Microcollections

Specimens MUST be marked accordingly:
  - Trough (Predose): Collect 0-30 minutes prior to next dose
  - Peak (Postdose): Collect 30 minutes after IV infusion or 1-2 hours after IM injection
  - Random: Collect immediately prior to next dose
  - Once daily Aminoglycosides: Collect 6-14 hours after start of dose (usually 8 hours)

Record time of last dose on requisition.

Specimen Handling
Additional Information

List any other antibiotics patient is receiving.

For additional information, see Half-life and Time to Steady State.

Testing Location Chemistry-ACH, FMC, PLC, RGH
Testing Frequency Daily
Alternate Name(s) Garamycin
Reference Interval Therapeutic Target for
Multiple-Daily Dosing

Pre-dose

0.0-1.9 mg/L

Post-dose

5.0-10.0 mg/L


Therapeutic Target for
Extended Interval Dosing

Pre-dose

0.0-1.0 mg/L

Post-dose

Contraindicated for adults with normal renal function


Click here for critical values.