LOINCActiveBoth

LOINC Code 6928-6: Rheumatoid factor IA Qn (S)

6928-6 is a LOINC code used to identify Rheumatoid factor IA Qn (S) 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 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 Rheumatoid factor. 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: IA

What it does not mean

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

Key facts

  • Rheumatoid factor [Units/volume] in Serum by Immunoassay
  • Rheumatoid factor
  • Arbitrary concentration; EIA; ELFA; ELISA; Enzyme immunoassay; Fac; Fact; IAA; MEIA; Point in time; QNT; Quan; Quant; Quantitative; Random; RF; Serology; Serum; SR; SUDS

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

Rheumatoid factor IA Qn (S)Rheumatoid factor [Units/volume] in Serum by ImmunoassayRheumatoid fact Ser IA-aCncRheumatoid factorSERORheumatoid factor, BloodACnc

Frequently asked questions

Code details

Code6928-6
SystemLOINC
Display nameRheumatoid factor IA Qn (S)
DescriptionRheumatoid factor
Short nameRheumatoid fact Ser IA-aCnc
ComponentRheumatoid factor
PropertyACnc
TimingPt
System (specimen)Ser
ScaleQn
MethodIA
ClassSERO
Example unitsIU/mL
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0h(2)
Last changed2.73

Consumer names

Rheumatoid factor, Blood

Part names

Rheumatoid factorACncPtSerQnIAArbitrary ConcentrationPoint in time (spot)SerumImmunoassay

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.

LOINC Code 6928-6 | HealthAssure