Item Value
Test name Gentamicin
Available Stat? No
Turn around times 4 hours
In House Availability 24 hours per day and 7 days per week
Performed by Parnassus Chemistry
Normal range
Therapeutic peak 5-10 mg/L

Trough levels:
Standard dosing < 2 mg/L (< 1 mg/L optimum)
Once daily, high dose < 1 mg/L (< 0.3 mg/L optimum)
ICN extended interval dosing < 2 mg/L (< 1.5 mg/L optimum)
CF extended interval dosing < 1 mg/L

Source of reference range: UCSF/SFGH/VASF joint guidelines for antimicrobial use in adults.

Click here for link
Container type Gold top or Light Green top
Amount to Collect 1 mL blood
Collection Instructions Time to Steady State: 2-3 doses (1 dose for ICN extended interval dosing).

Collect trough samples 30 minutes prior to 3rd or 4th dose.

For patients on hemodialysis collect just prior to and/or 1 hour post dialysis

For standard dosing draw peak samples 30 minutes after the end of infusion. For ICN extended interval dosing draw peak 30 minutes after end of 4th dose

Note the exact time of collection on BOTH the sample and the requisition

Bring to lab immediately for processing if patient also receiving carbenicillin or other high dose penicillin or cephalosporin because prolonged interactions with these drugs (8 hours or more) at room temperature can modify amino groups and interfere with aminoglycoside assay
Sample type Serum or plasma

If you have additional questions regarding this test, please call: 415-353-1667