LOINCActiveOrder

LOINC Code 75843-3: Simplified disease activity index [SDAI]

75843-3 is a LOINC code used to identify Simplified disease activity index [SDAI] 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 Simplified disease activity index. It is commonly used with the system or sample type ^Patient.

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 Simplified disease activity index. It is commonly used with the system or sample type ^Patient.

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: Order
  • Panel type: Panel
  • Method: SDAI

What it does not mean

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

Key facts

Simplified disease activity index [SDAI]
Simplified disease activity index
The Simplified (or Simple) Disease Activity Index (SDAI) instrument contains several measurements or scores used to determine rheumatoid arthritis disease activity. The overall SDAI score is calculated using a linear sum of the followingtender 28 joint count, swollen 28 joint count, patient global assessment, physician global assessment, and C-reactive protein levels. The SDAI is similar to the CDAI (Clinical Disease Activity Index, [LOINC: 75842-5]), which uses the same measures as the SDAI except it does not include the measurement of C-reactive protein levels.
Activ; Actvty; Dis; Diseases; Dz; Movements; Pan; Panel; PANEL.SURVEY.GNHLTH; Panl; Pnl; Point in time; Random; Survey; SURVEY.GNHLTH

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

Simplified disease activity index [SDAI]Simplified disease activity indexPANEL.SURVEY.GNHLTH-Pt^PatientSDAI

Frequently asked questions

Code details

Code75843-3
SystemLOINC
Display nameSimplified disease activity index [SDAI]
DescriptionSimplified disease activity index
ComponentSimplified disease activity index
Property-
TimingPt
System (specimen)^Patient
Scale-
MethodSDAI
ClassPANEL.SURVEY.GNHLTH
StatusACTIVE
Order/ObservationOrder

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.50
Last changed2.71

Part names

Simplified disease activity index-Pt^PatientSDAIPoint in time (spot)

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 75843-3 | HealthAssure