What does this LOINC code represent?

This LOINC code identifies a lab observation, measurement, question, or clinical concept in a standardized format.

Is this enough to understand my test result?

No. The code identifies the test or observation, but the interpretation depends on the actual result, reference range, and clinical context.

LOINCActiveObservation

LOINC Code 42720-3: Clindamycin Agar diffusion.erythromycin induced resistance [Susc]

Name: LOINC Code 42720-3: Clindamycin Agar diffusion.erythromycin induced resistance [Susc]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:28.128Z

42720-3 is a LOINC code used to identify Clindamycin Agar diffusion.erythromycin induced resistance [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 Clindamycin. 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 Clindamycin. 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.erythromycin induced resistance

What it does not mean

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

Key facts

Clindamycin [Susceptibility] by Agar diffusion.erythromycin induced resistance
Clindamycin
Agar diff eryth ind res; ANTIBIOTIC SUSCEPTIBILITIES; AST; c306; Cleocin; CLIJ; D Test; Dalacin; Disk diffusion; Erythromycin ind res; ID; Infectious Disease; InfectiousDisease; Islt; Isol; KB; Kirby-bauer; Point in time; Random; Resist; Resistanc; Resistant; Resistent; Sobelin; Sus; Suscept; Susceptibilities; Susceptibility; Susceptibilty; Topical

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

Clindamycin Agar diffusion.erythromycin induced resistance [Susc]Clindamycin [Susceptibility] by Agar diffusion.erythromycin induced resistanceClindamycin Islt Agar diff eryth ind resClindamycinABXBACTSusceptibility to ClindamycinSusc

Frequently asked questions

Code details

Code42720-3

SystemLOINC

Display nameClindamycin Agar diffusion.erythromycin induced resistance [Susc]

DescriptionClindamycin

Short nameClindamycin Islt Agar diff eryth ind res

ComponentClindamycin

PropertySusc

TimingPt

System (specimen)Isolate

ScaleOrdQn

MethodAgar diffusion.erythromycin induced resistance

ClassABXBACT

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.16

Last changed2.82

Consumer names

Susceptibility to Clindamycin

Part names

ClindamycinSuscPtIsolateOrdQnAgar diffusion.erythromycin induced resistanceSusceptibility (microorganisms)Point in time (spot)

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.