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AUSTRALIA · HOSPITAL & PATHOLOGY ACCESS Link Medical Products Pty Ltd · a Clinigen company
CR-GNB
CARBAPENEM-RESISTANT GRAM-NEGATIVES
Link · a Clinigen company
Serious Gram-negative infection · laboratory pathway

When carbapenems fail, the laboratory still has to answer.

This portal is for Australian hospital and NATA pathology laboratories that need reagents to identify carbapenem-resistant Gram-negative bacteria and to measure susceptibility to the siderophore cephalosporin class. Eligible labs order kits here. There is no charge to the laboratory.

The infections this pathway is built for

Carbapenem-resistant Gram-negative organisms are a priority antimicrobial-resistance threat. They cause hard-to-treat infection in hospitals — especially the urinary tract, and pneumonia acquired in hospital or on a ventilator. The work below is about finding those bacteria and knowing which last-line β-lactam still has activity.

cUTI / pyelonephritis

Complicated urinary tract infection

When Enterobacterales or Pseudomonas in urine or kidney tissue no longer respond to carbapenems, the isolate must be confirmed as carbapenemase-producing and then tested against remaining options.

HABP / VABP

Hospital and ventilator pneumonia

MDR P. aeruginosa, A. baumannii complex and carbapenem-resistant Enterobacterales in respiratory samples need rapid enzyme ID plus a reliable susceptibility method — disk first, MIC if the zone is uncertain.

Limited options

Aerobic Gram-negative, last-line setting

Metallo-β-lactamase and OXA-48-like producers, and non-fermenters that fail meropenem, sit outside routine automated panels. That is why a dedicated pack exists for the bench.

What the laboratory is actually answering

Test 1 — Is this a carbapenemase producer?

After species ID (MALDI-TOF or equivalent) and a meropenem screen, a 5-plex lateral-flow assay differentiates KPC, NDM, VIM, IMP and OXA-48-like enzymes from a colony in about 15 minutes. PCR platforms remain available where the lab already runs them.

Test 2 — Does the siderophore cephalosporin still work?

A 30 µg disk on standard Mueller-Hinton agar is the everyday screen. If the zone sits in a technical grey area, or a MIC must be reported, an iron-depleted broth microdilution panel is used. Routine Vitek/Phoenix panels do not replace that MIC method.