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.

LOINCActiveBoth

LOINC Code 33688-3: Y. pestis Ag IF Ql (Isol)

Name: LOINC Code 33688-3: Y. pestis Ag IF Ql (Isol)
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

33688-3 is a LOINC code used to identify Y. pestis Ag IF 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 Yersinia pestis Ag. It is commonly used with the system or sample type Isolate.

Reviewed by HealthAssure Clinical TeamUpdated 25 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 Yersinia pestis Ag. 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: Both
Method: IF

What it does not mean

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

Key facts

Yersinia pestis Ag [Presence] in Isolate by Immunofluorescence
Yersinia pestis Ag
ACIF; Anticomplement Immunofluorescence; Antigen; Antigens; DFA; FA; Fluorescent antibody; Fluoresent; ID; IFA; Immune fluorescence; Immunoflour; Immunofluor; Immunofluorescence; Infectious Disease; InfectiousDisease; Islt; Isol; Microbiology; Ordinal; P pestis; Pasturella pestis; Plague; Point in time; PR; QL; Qual; Qualitative; Random; Screen; Time Resolved Fluorescence; TRF; Y pestis

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.

Related SNOMED CT concepts

705114005SNOMED CT mapping for Y. pestis Ag IF Ql (Isol) (33688-3)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Y. pestis Ag IF Ql (Isol)Yersinia pestis Ag [Presence] in Isolate by ImmunofluorescenceY pestis Ag Islt Ql IFYersinia pestis AgMICROYersinia pestis antigenPrThr

Frequently asked questions

Code details

Code33688-3

SystemLOINC

Display nameY. pestis Ag IF Ql (Isol)

DescriptionYersinia pestis Ag

Short nameY pestis Ag Islt Ql IF

ComponentYersinia pestis Ag

PropertyPrThr

TimingPt

System (specimen)Isolate

ScaleOrd

MethodIF

ClassMICRO

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.09

Last changed2.65

Consumer names

Yersinia pestis antigen

Part names

Yersinia pestis AgPrThrPtIsolateOrdIFPresence or ThresholdPoint in time (spot)Immunofluorescence (IF)

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.