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.

LOINCBoth

LOINC Code 34421-8: Rubella virus IgG avidity (S) [Ratio]

Name: LOINC Code 34421-8: Rubella virus IgG avidity (S) [Ratio]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:21.188Z

34421-8 is a LOINC code used to identify Rubella virus IgG avidity (S) [Ratio] 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 Rubella virus Ab.IgG avidity. 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 Rubella virus Ab.IgG avidity. 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: DISCOURAGED
Order vs observation: Both

What it does not mean

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

Key facts

Rubella virus IgG Ab avidity [Ratio] in Serum
Rubella virus Ab.IgG avidity
ABS; Aby; Antby; Anti; Antibodies; Antibody; Autoantibodies; Autoantibody; Congenital rubella syndrome; German measles; ID; Immune globulin G; Immunoglobulin G; Infectious Disease; InfectiousDisease; Microbiology; Point in time; QNT; Quan; Quant; Quantitative; Random; Ratios; Rto; RUBV; 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

Rubella virus IgG avidity (S) [Ratio]Rubella virus IgG Ab avidity [Ratio] in SerumRUBV IgG Avidity Ser-RtoRubella virus Ab.IgG avidityMICRORubella virus IgG avidity, BloodRatio

Frequently asked questions

Code details

Code34421-8

SystemLOINC

Display nameRubella virus IgG avidity (S) [Ratio]

DescriptionRubella virus Ab.IgG avidity

Short nameRUBV IgG Avidity Ser-Rto

ComponentRubella virus Ab.IgG avidity

PropertyRatio

TimingPt

System (specimen)Ser

ScaleQn

ClassMICRO

StatusDISCOURAGED

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.10

Last changed2.73

Consumer names

Rubella virus IgG avidity, Blood

Part names

Rubella virus Ab.IgG avidityRatioPtSerQnRubella virus IgG AvidityPoint 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.