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 42721-1: Oxacillin Resistant Staphylococcus sp isolate LA Ql (Isol)

Name: LOINC Code 42721-1: Oxacillin Resistant Staphylococcus sp isolate LA Ql (Isol)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:28.128Z

42721-1 is a LOINC code used to identify Oxacillin Resistant Staphylococcus sp isolate LA Ql (Isol) 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 Staphylococcus sp.oxacillin resistant isolate. 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 Staphylococcus sp.oxacillin resistant isolate. 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: LA

What it does not mean

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

Key facts

Oxacillin Resistant Staphylococcus sp isolate [Presence] in Isolate by Latex agglutination
Staphylococcus sp.oxacillin resistant isolate
Bactocill; c116; ID; Infectious Disease; InfectiousDisease; Islt; Isol; LAT; Latex agglutination; Microbiology; OR Staphylococcus; Ordinal; OxRes Staph; PBP2'; Penicillin binding protein; Point in time; PR; Prostaphlin; QL; Qual; Qualitative; Random; Screen; species; spp; Staph

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

Oxacillin Resistant Staphylococcus sp isolate LA Ql (Isol)Oxacillin Resistant Staphylococcus sp isolate [Presence] in Isolate by Latex agglutinationOxRes Staph Islt Ql LAStaphylococcus sp.oxacillin resistant isolateMICROOxacillin resistant staphylococcus species isolatePrThr

Frequently asked questions

Code details

Code42721-1

SystemLOINC

Display nameOxacillin Resistant Staphylococcus sp isolate LA Ql (Isol)

DescriptionStaphylococcus sp.oxacillin resistant isolate

Short nameOxRes Staph Islt Ql LA

ComponentStaphylococcus sp.oxacillin resistant isolate

PropertyPrThr

TimingPt

System (specimen)Isolate

ScaleOrd

MethodLA

ClassMICRO

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.16

Last changed2.73

Consumer names

Oxacillin resistant staphylococcus species isolate

Part names

Staphylococcus sp.oxacillin resistant isolatePrThrPtIsolateOrdLAOxacillin Resistant Staphylococcus sp isolatePresence or ThresholdPoint in time (spot)Latex agglutination

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.