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LOINC Code 21490-8: Rickettsia (Proteus OX2) Ab LA (S) [Titer]

21490-8 is a LOINC code used to identify Rickettsia (Proteus OX2) Ab LA (S) [Titer] 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 (Proteus OX2) 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 (Proteus OX2) 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 (Proteus OX2) Ab [Titer] in Serum by Latex agglutination
  • Rickettsia (Proteus OX2) Ab
  • ABS; Aby; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; Dilution factor; Dilution Factor (Titer); ID; Infectious Disease; InfectiousDisease; LAT; Latex agglutination; Microbiology; Point in time; Random; Ricket; Rickettsial; Serum; SmQn; SR; Titer; Titered; Titre; Ttr; Weil felix agglutination test

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

Rickettsia (Proteus OX2) Ab LA (S) [Titer]Rickettsia (Proteus OX2) Ab [Titer] in Serum by Latex agglutinationProteus OX2 Ab Titr Ser LARickettsia (Proteus OX2) AbMICRORickettsia (Proteus OX2) antibody, BloodTitr

Frequently asked questions

Code details

Code21490-8
SystemLOINC
Display nameRickettsia (Proteus OX2) Ab LA (S) [Titer]
DescriptionRickettsia (Proteus OX2) Ab
Short nameProteus OX2 Ab Titr Ser LA
ComponentRickettsia (Proteus OX2) Ab
PropertyTitr
TimingPt
System (specimen)Ser
ScaleSemiQn
MethodLA
ClassMICRO
Example unitstiter
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0m
Last changed2.75

Consumer names

Rickettsia (Proteus OX2) antibody, Blood

Part names

Rickettsia (Proteus OX2) AbTitrPtSerSemiQnLATiterPoint 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.