OMERACT (Outcome Measures in Rheumatology) is an independent initiative of international health professionals interested in outcome measures in rheumatology. Over the last 20 years, OMERACT has served a critical role in the development and validation of clinical and radiographic outcome measures in rheumatoid arthritis, osteoarthritis, psoriatic arthritis, fibromyalgia, and other rheumatic diseases. OMERACT is coordinated by an executive committee and supervised by a steering committee. OMERACT organizes consensus conferences every two years, and employs various other means to stimulate the development of consensus in outcome measurement within the context of musculoskeletal and autoimmune diseases.  

The OMERACT Process

OMERACT strives to improve endpoint outcome measurement through a data driven, iterative consensus process involving relevant stakeholder groups.  The work of OMERACT is facilitated by participants within various working groups who provide input on the development of the OMERACT research agendas. The individual research agendas focus on measurement issues considering Truth, Discrimination and Feasibility, the backbone of the OMERACT Filter.  A powerful and important aspect of OMERACT is the integration of patients at each stage of the OMERACT process. This patient input along with clinical trialist insight, epidemiologist assessment, and industry perspective, has led OMERACT to be a unique decision making group in developing outcome measures for all types of clinical trials and observational research.      

Truth  is the measure truthful, does it measure what it intends to measure? Is the result unbiased and relevant? This criterion captures the issues of face, content, construct and criterion validity.  

Discrimination  Does the measure discriminate between situations that are of interest? The situations can be states at one time (for classification or prognosis) or states at different times (to measure change). This criterion captures the issues of reliability and sensitivity to change.  

Feasibility  Can the measure be applied easily, given constraints of time, money, and interpretability? This criterion addresses the pragmatic reality of the use of the measure, one that may be decisive in determining a measure’s success.  

When OMERACT endorses a core set, it is because there is consensus amongst OMERACT participants that the evidence to supports this has been clearly demonstrated.    

OMERACT Domain Selection

OMERACT Patient Involvement

Check out this great video

Spirit of OMERACT


Each one of our 8 C’s can be related to one of the three factors


2.Communication: Respectful across 5Ps stakeholders esp patients 

3.Collaboration (truly participatory across all disciplines/sectors, international representation,)

4.Critical (evidence driven)

5.Careful/conscientious (apply critical thinking, systematic)

6.Concrete outcomes (e.g. OMERACT Filter; Core Sets; Methods )

7.Continuous Learning- updated methods and core sets

8.Continuity – Planed succession through Fellowship Pgm