How to properly gauge worsening of cognitive decline

Is there a consensus in the assessment of cognitive decline worsening which combines several neuropsychological battery tests? For example, in assessing the worsening of a patient's dementia I would think it is insufficient to simply look at his/her CDR score or MMSE score alone. Is there a combination of CDR, MMSE and perhaps some other tests that over a one-year period would indicate worsening of decline? Is there a consensus variable that combines several tests or do researchers gauge worsening each in their own way?