Global Assessment Scale for Wilson's Disease (GAS for WD)

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Global Assessment Scale for Wilson's Disease


Acronym: GAS for WD

Authors: Annu Aggarwal, Nitin Aggarwal, Aabha Nagral, Govindji Jankharia, and Mohit Bhatt

The Global Assessment Scale for Wilson's Disease (GAS for WD) measures the severity of the effects of Wilson’s disease on multiple systems. The scale has two parts, or tiers. The first tier measures disability in four areas: liver, cognition and behavior, motor, and osseomuscular. The second tier scores neurological dysfunction. The GAS for WD was designed for use in routine clinical practice to track disease progression and response to treatment in patients.

Original Publication View the Scale (PDF)

Year Published: 2009

Scale Last Updated: Unchanged since publication

Assessment Type: ClinRO

Estimated Time to Complete: 30 minutes

Available Translations: None

Additional Scale Publications:

Volpert HM, Pfeiffenberger J, Gröner JB, Stremmel W, Gotthardt DN, Schäfer M, Weiss KH, Weiler M. Comparative assessment of clinical rating scales in Wilson’s disease. BMC Neurology. 2017 Dec;17(1):140.

MDS-Owned Rating Scales   

Global Assessment Scale for Wilson's Disease (GAS for WD)

Global Dystonia Scale (GDS)

MDS-Unified Parkinson's Disease Rating Scale (MDS-UPDRS)

MDS Non-Motor Rating Scale (MDS-NMS)

Modified Bradykinesia Rating Scale (MBRS)

Non-Motor Symptoms Scale (NMSS)

Non-Motor Symptoms Questionnaire (NMSQ)

Non-Motor Fluctuation Assessment (NoMoFA) Questionnaire

PKAN Disease Rating Scale (PKAN-DRS)

Progressive Supranuclear Palsy Clinical Deficits Scale (PSP-CDS)

Quality of Life Essential Tremor Questionnaire (QUEST)

Rating Scale for Psychogenic Movement Disorders (PMD)

Rush Dyskinesia Rating Scale (RDRS)

Rush Video-Based Tic Rating Scale

SCales for Outcomes in PArkinson’s disease - Autonomic Dysfunction (SCOPA-AUT)

SCales for Outcomes in PArkinson’s disease – Diary Card (SCOPA-DC)

SCales for Outcomes in PArkinson’s disease – Psychiatric Complications (SCOPA-PC)

SCales for Outcomes in PArkinson’s disease – Psychosocial Functioning​ (SCOPA-PS)

SCales for Outcomes in PArkinson’s disease – Sleep (SCOPA-SLEEP)

SCales for Outcomes in PArkinson's disease-COGnition (SCOPA-COG)

Short Parkinson's Evaluation Scale (SPES)/SCales for Outcomes in PArkinson’s disease – Motor Functions (SPES/SCOPA-Motor)

UFMG Sydenham's Chorea Rating Scale (USCRS)​

Unified Dyskinesia Rating Scale (UDysRS)

Unified Dystonia Rating Scale (UDRS)

Unified Multiple System Atrophy Rating Scale (UMSARS) 


For more information about all MDS Rating Scales, please contact the International Secretariat.

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