TETRAS
The Essential Tremor Rating Assessment Scale
The Essential Tremor Rating Assessment Scale (TETRAS) is a comprehensive rating scale for essential tremor — developed, validated, and published by the Tremor Research Group. It is used by the most recent essential tremor trials. TETRAS can be licensed, and with it the TRG can provide training, credentialing, scale testing, and expert ratings.
Rater certification
Investigators invited by a study sponsor train and certify in the secure portal, in three steps:
Watch the lecture
A recorded introduction to the scale.
Rate six patient videos
Score each on the 19-item scoresheet; 80% within ±0.5 of the expert passes.
Get your certificate
Issued automatically and downloadable as a PDF.
Licensing & access
TETRAS can be licensed for clinical trials, with training, credentialing, scale testing and expert ratings. To request rater access for your study, contact the TRG.
For study sponsorsWhat raters score
19 items in five groups
- Head, face & voice
- 3
- Upper limb
- 6
- Lower limb
- 4
- Drawing & writing
- 5
- Standing
- 1