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 99434-3: Quinoa IgG4 (S) [Mass/Vol]

Name: LOINC Code 99434-3: Quinoa IgG4 (S) [Mass/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:33.065Z

99434-3 is a LOINC code used to identify Quinoa IgG4 (S) [Mass/Vol] 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 Chenopodium quinoa Ab.IgG4. It is commonly used with the system or sample type Ser.

Reviewed by HealthAssure Clinical TeamUpdated 21 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 Chenopodium quinoa Ab.IgG4. 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

What it does not mean

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

Key facts

Quinoa IgG4 Ab [Mass/volume] in Serum
Chenopodium quinoa Ab.IgG4
ABS; Aby; Allergen; Allergens; ALLERGY TESTING; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; f347; Level; Mass concentration; Point in time; QNT; Quan; Quant; Quantitative; Quinoa; Random; Rf347; Serum; SR

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

Quinoa IgG4 (S) [Mass/Vol]Quinoa IgG4 Ab [Mass/volume] in SerumQuinoa IgG4-mCncChenopodium quinoa Ab.IgG4ALLERGYQuinoa IgG4 antibodyMCnc

Frequently asked questions

Code details

Code99434-3

SystemLOINC

Display nameQuinoa IgG4 (S) [Mass/Vol]

DescriptionChenopodium quinoa Ab.IgG4

Short nameQuinoa IgG4-mCnc

ComponentChenopodium quinoa Ab.IgG4

PropertyMCnc

TimingPt

System (specimen)Ser

ScaleQn

ClassALLERGY

Example unitsmg/L

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.72

Last changed2.72

Consumer names

Quinoa IgG4 antibody

Part names

Chenopodium quinoa Ab.IgG4MCncPtSerQnMass ConcentrationPoint in time (spot)Serum

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.