Extended-Spectrum Beta-Lactamase Confirmation [36470X]

Test Code

11490

CPT Codes
87184

Preferred Specimen

Pure isolate on an agar slant in a double-walled container

Instructions

Stability of isolates will be determined by the laboratory. Organism must be viable. Test is only applicable to Escherichia coli, Klebsiella pnuemoniae, Klebsiella oxytoca, and Proteus mirabilis isolates.

Transport Temperature

Room temperature

Specimen Stability

Room temperature: 7 days
Refrigerated: 7 days
Frozen: Unacceptable

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Mixed cultures

Methodology
Disk-Diffusion

Setup Schedule

Set up: Daily a.m.; Report available: 2-5 days

Reference Range

See Laboratory Report

Clinical Significance

Organisms producing ESBLs may be clinically resistant to therapy with penicillins, cephalosporins, or aztreonam, despite apparent in vitro susceptibility to some of these agents if only routine susceptibility testing is performed.

Performing Laboratory
Quest Diagnostics Nichols Institute
14225 Newbrook Dr
Chantilly, VA 20153

The CPT Codes provided in this document 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 payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.