With gratitude we have read the letter by Bruno et al. [1] commenting on our article “Frailty is associated with hospital readmission in geriatric patients: A prognostic study” [2]. As stated by the opponents frailty assessment is essential in the management of older patients suffering from acute illness. However, frailty assessment is complex due to many dimensions of the patient’s health and daily life.

The Comprehensive Geriatric Assessment (CGA) is a corner stone in the multi-disciplinary working process of getting a 360-degree view on the health status of an older patient. CGA is defined as ‘a multi-dimensional, multi-disciplinary diagnostic and therapeutic process conducted to determine the medical, mental, and functional problems of older people with frailty so that a coordinated and integrated plan for treatment and follow-up can be developed’ [3]. The Multidimensional Prognostic Index is based upon the CGA, and is a method to systematically assess geriatric patients.

In geriatric departments, CGA is a well-established working method producing identification and quantification of the problems of older patients followed by personalized interventions [4]. During hospitalization, the MPI creates an overview of the needed clinical decisions and of which initiatives that should be initiated for the patients immediately after discharge such as need for home care and rehabilitation.

In recent years, the CGA has been further refined by validated testing. In the next few years, entering the CGA-domains directly into the patients’ electronical medical chart is likely to become an integrated part of treatment, thereby providing the foundation for time saving and automatized frailty assessment. The MPI assessment provides a highly standardized and more comprehensive frailty assessment than the Clinical Frailty Scale (CFS). We believe both the CFS and the MPI are applicable and worth considering in the assessment of frailty under various circumstances.

Finally, it is correct that frailty is associated with higher age. However, not all of the oldest old are frail, and do not need the same level of attention as a frail patient of similar or even younger age.