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 13930-3: Rheumatoid factor Aggl (Syn fld) [Titer]

Name: LOINC Code 13930-3: Rheumatoid factor Aggl (Syn fld) [Titer]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

13930-3 is a LOINC code used to identify Rheumatoid factor Aggl (Syn fld) [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 Rheumatoid factor. It is commonly used with the system or sample type Synv fld.

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 Rheumatoid factor. It is commonly used with the system or sample type Synv fld.

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: Aggl

What it does not mean

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

Key facts

Rheumatoid factor [Titer] in Synovial fluid by Agglutination
Rheumatoid factor
Agg; Agglut; Agglutination; Dilution factor; Dilution Factor (Titer); Fac; Fact; Joint aspirate; Joint fld; Joint flu; Joint fluid; Point in time; Random; RF; Serology; SF; SmQn; Snv; Syn; Syn fl; Synov; Synovial fluid; Titer; Titered; Titre; Ttr

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 Rheumatoid factor Aggl (Syn fld) [Titer] (13930-3)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Rheumatoid factor Aggl (Syn fld) [Titer]Rheumatoid factor [Titer] in Synovial fluid by AgglutinationRheumatoid fact Titr Snv AgglRheumatoid factorSERORheumatoid factor, Synovial fluidTitr

Frequently asked questions

Code details

Code13930-3

SystemLOINC

Display nameRheumatoid factor Aggl (Syn fld) [Titer]

DescriptionRheumatoid factor

Short nameRheumatoid fact Titr Snv Aggl

ComponentRheumatoid factor

PropertyTitr

TimingPt

System (specimen)Synv fld

ScaleSemiQn

MethodAggl

ClassSERO

Example unitstiter

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0k

Last changed2.75

Consumer names

Rheumatoid factor, Synovial fluid

Part names

Rheumatoid factorTitrPtSynv fldSemiQnAgglTiterPoint in time (spot)Synovial fluidAgglutination

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.