LOINCActiveObservation

LOINC Code 41-4: Azlocillin Disk diffusion (KB) [Susc]

41-4 is a LOINC code used to identify Azlocillin Disk diffusion (KB) [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 Azlocillin. It is commonly used with the system or sample type Isolate.

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 Azlocillin. It is commonly used with the system or sample type Isolate.

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

  • Azlocillin [Susceptibility] by Disk diffusion (KB)
  • Azlocillin
  • ANTIBIOTIC SUSCEPTIBILITIES; AST; Azlin; Disk diffusion; ID; Infectious Disease; InfectiousDisease; Islt; Isol; KB; Kirby-bauer; Point in time; Random; Securopen; 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

Azlocillin Disk diffusion (KB) [Susc]Azlocillin [Susceptibility] by Disk diffusion (KB)Azlocillin Islt KBAzlocillinABXBACTSusceptibility to AzlocillinSusc

Frequently asked questions

Code details

Code41-4
SystemLOINC
Display nameAzlocillin Disk diffusion (KB) [Susc]
DescriptionAzlocillin
Short nameAzlocillin Islt KB
ComponentAzlocillin
PropertySusc
TimingPt
System (specimen)Isolate
ScaleOrdQn
MethodAgar diffusion
ClassABXBACT
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0
Last changed2.21

Consumer names

Susceptibility to Azlocillin

Part names

AzlocillinSuscPtIsolateOrdQnAgar 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 41-4 | HealthAssure