Note regarding patients who are also on penecillins or cephalosporin:
Sample containing carbenicillin or piperacillin should be stored frozen if a delay in analysis of more than 8 hours is anticipated. Failure to freeze samples containing these antibiotics may result in falsely low tobramycin levels due to in vitro inactivation.
Lt green plasma separator (PST)
Gold serum separator (SST) tube
Refrigerated - 7 days
Particle-enhanced turbidimetric inhibition immunoassay (PETINIA)
> 12.0 µg/mL