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.

LOINCActiveObservation

LOINC Code 105540-9: Rheumatoid arthritis disease activity Ql

Name: LOINC Code 105540-9: Rheumatoid arthritis disease activity Ql
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:19.135Z

105540-9 is a LOINC code used to identify Rheumatoid arthritis disease activity Ql 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 arthritis disease activity. It is commonly used with the system or sample type Ser/Plas.

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 arthritis disease activity. It is commonly used with the system or sample type Ser/Plas.

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: Observation

What it does not mean

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

Key facts

Rheumatoid arthritis disease activity [Score] in Serum or Plasma Qualitative
Rheumatoid arthritis disease activity
Activ; Actvty; Arth; Chemistry; Dis; Diseases; Dz; MDAS; Movements; Multi-biomarker disease activity score; Ordinal; Pl; Plasma; Plsm; Point in time; QL; Qual; Qualitative; RA; Random; Scale; Scre; Screen; SerP; SerPl; SerPlas; Serum; Serum or plasma; 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 arthritis disease activity QlRheumatoid arthritis disease activity [Score] in Serum or Plasma QualitativeSerPl QlRheumatoid arthritis disease activityCHEMRheumatoid arthritis disease activity, BloodScore

Frequently asked questions

Code details

Code105540-9

SystemLOINC

Display nameRheumatoid arthritis disease activity Ql

DescriptionRheumatoid arthritis disease activity

Short nameSerPl Ql

ComponentRheumatoid arthritis disease activity

PropertyScore

TimingPt

System (specimen)Ser/Plas

ScaleOrd

ClassCHEM

Example unitsscore

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.78

Last changed2.78

Consumer names

Rheumatoid arthritis disease activity, Blood

Part names

Rheumatoid arthritis disease activityScorePtSer/PlasOrdPoint in time (spot)Serum or Plasma

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.