The concentration of antimicrobial agents in body fluids, most notably serum or plasma, are used to regulate therapy to ensure effective dosing (especially with oral agents where GI absorption is in question), to monitor accumulation to help minimize toxicity, and to help evaluate the pharmacokinetics of new agents. Both peak and trough levels obtained immediately after dosing or immediately prior to dosing, respectively, may be monitored.
Specimens collected just before or within 15 minutes of the
next antibiotic dose represent the trough levels. Specimens
obtained within 15-30 minutes after the end of IV infusion or
45-60 minutes after an IM injection or 90 minutes after oral
intake represent the peak level.
Reported (Analytical Time)
The CPT codes provided are based on AMA guidelines and are for informational purposes only.
CPT coding is the sole responsibility of the billing party.
Please direct any questions regarding coding to the payer being billed.
Reject Criteria: Serum separator tubes; other body fluids; other specimen types