Some diseases are represented using a staging and/or grading system to signify the severity, extent, or rate of growth of a disease. For example, chronic kidney disease is represented with five stages determined by level of kidney function.

Assessment scale requests

• Generally, requests to add the most recent version of an assessment scale are accepted.
• Updated versions of existing content are also accepted. 
• Older versions may be added if justification is appropriate.  Older versions may also remain as active concepts due to the need to retain history on the use of specific instruments.  

Modeling

Concepts of the type |Assessment using X assessment scale| are modeled with a proximal primitive parent of  or one of its subtypes, as appropriate.

For example, 

• •  has a parent of 

(See also Why is Content Rejected page, Proprietary Names for information about use of Questionnaire and Scale names)