LOINCActiveObservation

LOINC Code 55190-3: cefTRIAXone Disk diffusion (KB) (Isolate.meningitis) [Susc]

55190-3 is a LOINC code used to identify cefTRIAXone Disk diffusion (KB) (Isolate.meningitis) [Susc] in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component cefTRIAXone. It is commonly used with the system or sample type Isolate.meningitis.

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component cefTRIAXone. It is commonly used with the system or sample type Isolate.meningitis.

When is it used?

  • Used in lab systems, EHRs, and clinical data exchange.
  • May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
  • Status: ACTIVE
  • Order vs observation: Observation
  • Method: Agar diffusion

What it does not mean

  • The code identifies the observation or test, not the actual result.

Key facts

  • cefTRIAXone [Susceptibility] for meningitis by Disk diffusion (KB)
  • cefTRIAXone
  • Susceptibility of an isolate to ceftriaxone in the context of a patient with meningitis, i.e., the "meningitis breakpoint". Various agencies, including the FDA and CLSI in the U.S. and EUCAST in Europe, publish guidelines for determining susceptibility of different organisms to different antimicrobials. In most cases, susceptibility does not vary by type of infection, but for a few specific types of infection, including meningitis, pneumonia and urinary tract infection, certain antimicrobials have different susceptibility thresholds.
  • ANTIBIOTIC SUSCEPTIBILITIES; AST; c9; Disk diffusion; ID; Infectious Disease; InfectiousDisease; Islt; Islt.mening; Isol; KB; Kirby-bauer; Mening; Point in time; Random; Rocephin; ROCJ; Sus; Suscept; Susceptibilities; Susceptibility; Susceptibilty

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Common synonyms

cefTRIAXone Disk diffusion (KB) (Isolate.meningitis) [Susc]cefTRIAXone [Susceptibility] for meningitis by Disk diffusion (KB)cefTRIAXone Islt.mening KBcefTRIAXoneABXBACTSusceptibility to cefTRIAXoneSusc

Frequently asked questions

Code details

Code55190-3
SystemLOINC
Display namecefTRIAXone Disk diffusion (KB) (Isolate.meningitis) [Susc]
DescriptioncefTRIAXone
Short namecefTRIAXone Islt.mening KB
ComponentcefTRIAXone
PropertySusc
TimingPt
System (specimen)Isolate.meningitis
ScaleOrdQn
MethodAgar diffusion
ClassABXBACT
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.27
Last changed2.58

Consumer names

Susceptibility to cefTRIAXone

Part names

cefTRIAXoneSuscPtIsolate.meningitisOrdQnAgar diffusionSusceptibility (microorganisms)Point in time (spot)Disk diffusion (KB)

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.

LOINC Code 55190-3 | HealthAssure