Improving Therapeutic Decisions

ETEST PIPERACILLIN/TAZOBACTAM is a redesigned ETEST strip used to determine antibiotic susceptibility with on-scale Minimum Inhibitory Concentrations (MIC) for piperacillin/tazobactam, an important antibiotic used to treat serious infections.

  • Calibrated against the reference broth microdilution (BMD)
  • Precise MIC to reliably determine susceptibility

ETEST consists of a predefined gradient of antibiotic concentrations immobilized on a plastic strip and is used to determine the MIC of antibiotics and antifungal agents. ETEST complements the VITEK® 2 automated system platform Learn more about ETEST

Now FDA 510(k) Cleared!

ETEST Piperacillin/tazobactam
(P/T 0.016/4 - 256/4 µg/mL)

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ETEST Piperacillin/tazobactam is a quantitative technique for determining the susceptibility of Enterobacteriaceae, Pseudomonas aeruginosa, and Actinetobacter baumanii. Piperacillin/tazobactam, brand name Zosyn™, is the combination of piperacillin (an ureidopenicillin), with broad spectrum anti-bacterial activity, and tazobactam (a β-lactamase-inhibitor) which expands the antimicrobial spectrum. ETEST piperacillin/tazobactam provides an additional treatment solution for multi-drug resistant Gram-negative organisms and helps clinicians guide and manage therapy.

ETEST Piperacillin/tazobactam is FDA 510(k) cleared and is used to assess susceptibility to piperacillin/tazobactam, an antimicrobial agent developed to treat moderate to severe infections caused by piperacillin-resistant, piperacillin/tazobactam susceptible, and some strains of β-lactamase producing microorganisms.1

ETEST: Developed For New Resistance Challenges

Antimicrobial resistance challenges make appropriate use of antimicrobials critical. ETEST Piperacillin/tazobactam is one of several redesigned ETEST strips–part of an ongoing commitment to keep up-to-date with evolving microbiology needs. Other recent additions to the ETEST product line include ETEST Meropenem/vaborbactam and ETEST Telavancin.

% Essential Agreement
# Category Agreement
Enterobacteriaceae 775 96.4% 99.3%
Pseudomonas aeruginosa 119 98.3 93.3
Acinetobacter spp. 83 91.6 89.2

Notes: EA = % of MIC values within ± 1 dilution of the reference menthod.
Refer to Package Insert for additional performance data. 

ETEST - MIC Testing

ETEST complements the VITEK 2 system by offering a flexible and precise MIC platform to test additional antibiotics. The ETEST range offers more than 90 antimicrobial agents including antifungals as well as antimicrobial resistant detection references.

ETEST Piperacillin/tazobactam gradient strip is preformed and stable. It is a thin, inert and non-porous plastic strip comprised of a predefined antibiotic gradient used to determine the MIC, in μg/mL, against microorganisms tested on agar media after overnight incubation. In 16-20 hours of incubation, you can determine MIC values for the organism. This strip supplements our ETEST product range.

Content of the Kit

REF 421167 | ETEST Piperacillin/tazobactam (P/T)

Single Pack: 30 test strips

MIC range: 0.016/4 - 256/4 μg/mL

Ordering Contact Information

Customer Service: (800) 682-2666 

To place orders please visit:
our eCommerce store

For Technical information, please visit:


Zosyn™ is a registered trademark of Pfizer. 



 ETEST Catalog


 ETEST Price List

 ETEST P/T Flyer


PRN 053347 - Rev 01.A

Pioneering Diagnostics