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 54033-6: R. spotted fever group Ag Immune stain Ql (Tiss)

Name: LOINC Code 54033-6: R. spotted fever group Ag Immune stain Ql (Tiss)
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

54033-6 is a LOINC code used to identify R. spotted fever group Ag Immune stain Ql (Tiss) 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 Rickettsia spotted fever group Ag. It is commonly used with the system or sample type Tiss.

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 Rickettsia spotted fever group Ag. It is commonly used with the system or sample type Tiss.

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: Immune stain

What it does not mean

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

Key facts

Rickettsia spotted fever group Ag [Presence] in Tissue by Immune stain
Rickettsia spotted fever group Ag
Antigen; Antigens; ID; IHC; Imm; Immunohistochemical stain; Immunostain; ImStn; Imun; Imune; Infectious Disease; InfectiousDisease; Microbiology; Ordinal; Point in time; PR; QL; Qual; Qualitative; Random; Rick SF; Ricket; Rickettsial; Screen; St; Stains; Stn; Tissue; Tissue, unspecified

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 R. spotted fever group Ag Immune stain Ql (Tiss) (54033-6)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

R. spotted fever group Ag Immune stain Ql (Tiss)Rickettsia spotted fever group Ag [Presence] in Tissue by Immune stainRick SF Ag Tiss Ql ImStnRickettsia spotted fever group AgMICRORickettsia spotted fever group antigen, TissuePrThr

Frequently asked questions

Code details

Code54033-6

SystemLOINC

Display nameR. spotted fever group Ag Immune stain Ql (Tiss)

DescriptionRickettsia spotted fever group Ag

Short nameRick SF Ag Tiss Ql ImStn

ComponentRickettsia spotted fever group Ag

PropertyPrThr

TimingPt

System (specimen)Tiss

ScaleOrd

MethodImmune stain

ClassMICRO

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.26

Last changed2.56

Consumer names

Rickettsia spotted fever group antigen, Tissue

Part names

Rickettsia spotted fever group AgPrThrPtTissOrdImmune stainPresence or ThresholdPoint in time (spot)Tissue and Smears

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.