LOINCOrder

LOINC Code 108865-7: Rheumatoid factor IgM (S) [Measurement]

108865-7 is a LOINC code used to identify Rheumatoid factor IgM (S) [Measurement] 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.IgM. 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.IgM. 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: TRIAL
  • Order vs observation: Order

What it does not mean

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

Key facts

Rheumatoid factor IgM [Measurement] in Serum
Rheumatoid factor.IgM
This term is intended to collate similar measurements for the LOINC SNOMED CT Collaboration in an ontological view. Additionally, it can be used to communicate a laboratory order, either alone or in combination with specimen or other information in the order. It may NOT be used to report back the measured patient value. [https//lo.inc/ce2mb6]
Fac; Fact; Immune globulin M; Immunoglobulin M; Lab orders; Msmt; RF; RF IgM; 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

Rheumatoid factor IgM (S) [Measurement]Rheumatoid factor IgM [Measurement] in SerumRF IgM Msmt SerRheumatoid factor.IgMLABORDERS.ONTOLOGYRheumatoid factor IgM, Blood{Measurement}

Frequently asked questions

Code details

Code108865-7
SystemLOINC
Display nameRheumatoid factor IgM (S) [Measurement]
DescriptionRheumatoid factor.IgM
Short nameRF IgM Msmt Ser
ComponentRheumatoid factor.IgM
Property{Measurement}
Timing-
System (specimen)Ser
Scale-
ClassLABORDERS.ONTOLOGY
StatusTRIAL
Order/ObservationOrder

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.81
Last changed2.81

Consumer names

Rheumatoid factor IgM, Blood

Part names

Rheumatoid factor.IgM{Measurement}-SerRheumatoid factor IgMMeasurementSerum

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 108865-7 | HealthAssure