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 17539-8: R. typhi Ab LA Qn (S)

Name: LOINC Code 17539-8: R. typhi Ab LA Qn (S)
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

17539-8 is a LOINC code used to identify R. typhi Ab LA Qn (S) 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 typhi Ab. It is commonly used with the system or sample type Ser.

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 typhi Ab. It is commonly used with the system or sample type Ser.

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: LA

What it does not mean

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

Key facts

Rickettsia typhi Ab [Units/volume] in Serum by Latex agglutination
Rickettsia typhi Ab
ABS; Aby; Antby; Anti; Antibodies; Antibody; Arbitrary concentration; Autoantibodies; Autoantibody; Endemic typhus; ID; Infectious Disease; InfectiousDisease; LAT; Latex agglutination; Microbiology; Murine typhus; Point in time; QNT; Quan; Quant; Quantitative; R typhi; Random; Ricket; Rickettsial; Serum; SR; Typh; Typhus

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. typhi Ab LA Qn (S) (17539-8)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

R. typhi Ab LA Qn (S)Rickettsia typhi Ab [Units/volume] in Serum by Latex agglutinationR typhi Ab Ser LA-aCncRickettsia typhi AbMICRORickettsia typhi antibody, BloodACnc

Frequently asked questions

Code details

Code17539-8

SystemLOINC

Display nameR. typhi Ab LA Qn (S)

DescriptionRickettsia typhi Ab

Short nameR typhi Ab Ser LA-aCnc

ComponentRickettsia typhi Ab

PropertyACnc

TimingPt

System (specimen)Ser

ScaleQn

MethodLA

ClassMICRO

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0l

Last changed2.69

Consumer names

Rickettsia typhi antibody, Blood

Part names

Rickettsia typhi AbACncPtSerQnLAArbitrary ConcentrationPoint in time (spot)SerumLatex 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.