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 51451-3: B. quintana IgG Qn

Name: LOINC Code 51451-3: B. quintana IgG Qn
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

51451-3 is a LOINC code used to identify B. quintana IgG Qn 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 Bartonella quintana Ab.IgG. It is commonly used with the system or sample type Ser/Plas.

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 Bartonella quintana Ab.IgG. It is commonly used with the system or sample type Ser/Plas.

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

What it does not mean

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

Key facts

Bartonella quintana IgG Ab [Units/volume] in Serum or Plasma
Bartonella quintana Ab.IgG
ABS; Aby; Antby; Anti; Antibodies; Antibody; Arbitrary concentration; Autoantibodies; Autoantibody; B quintana; Cat Scratch Disease; Cat Scratch Fever; CSD; ID; Immune globulin G; Immunoglobulin G; Infectious Disease; InfectiousDisease; Microbiology; Pl; Plasma; Plsm; Point in time; QNT; Quan; Quant; Quantitative; R quintana; Random; Rochalimae quintana; Rochalimaea quintana; SerP; SerPl; SerPlas; Serum; Serum or plasma; SR; Trench fever

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 B. quintana IgG Qn (51451-3)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

B. quintana IgG QnBartonella quintana IgG Ab [Units/volume] in Serum or PlasmaB quintana IgG SerPl-aCncBartonella quintana Ab.IgGMICROBartonella quintana IgG antibody, BloodACnc

Frequently asked questions

Code details

Code51451-3

SystemLOINC

Display nameB. quintana IgG Qn

DescriptionBartonella quintana Ab.IgG

Short nameB quintana IgG SerPl-aCnc

ComponentBartonella quintana Ab.IgG

PropertyACnc

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassMICRO

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.22

Last changed2.69

Consumer names

Bartonella quintana IgG antibody, Blood

Part names

Bartonella quintana Ab.IgGACncPtSer/PlasQnBartonella quintana IgGArbitrary ConcentrationPoint in time (spot)Serum or Plasma

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.