Activities of Daily Living Assessment
Activities of daily living (ADL) assessment evaluates how independently a person performs the everyday tasks required for self-care and community living. It distinguishes basic activities such as bathing, dressing, toileting, transferring, and feeding from more complex instrumental activities such as managing money, medications, transportation, and housekeeping, and uses standardized indices to record the level of assistance needed.
Definition
Activities of daily living assessment is the structured rating of a person's ability to carry out basic self-care tasks (basic ADLs) and the more complex tasks needed for independent living (instrumental ADLs), typically expressed as a level of independence or amount of assistance required.
Scope
The topic covers the classic ADL and instrumental ADL frameworks and their canonical instruments — the Katz Index of ADL, the Lawton-Brody Instrumental Activities of Daily Living Scale, and the Barthel Index — and explains how these tools structure observation of self-care performance. It is reference and educational content describing assessment methods, not advice for assessing or managing a specific person.
Core questions
- What is the distinction between basic and instrumental activities of daily living?
- Which standardized indices capture self-care performance reliably?
- How does ADL status relate to the need for support, supervision, or care?
- How sensitive are ADL indices to meaningful change in functioning?
Key concepts
- Basic activities of daily living (BADL)
- Instrumental activities of daily living (IADL)
- Katz Index of ADL
- Lawton-Brody IADL Scale
- Barthel Index
- Level of independence and assistance
- Hierarchy of functional loss
Clinical relevance
ADL assessment helps describe a person's care needs, supports rehabilitation goal-setting and discharge planning, and contributes to eligibility decisions for support services. Here it is presented as reference material on how self-care is measured; it does not direct the care plan for any individual.
Evidence & guidelines
The Katz Index (1963) and the Barthel Index (1965) are long-established measures of basic self-care, while the Lawton-Brody scale (1969) extended assessment to instrumental activities. These instruments are widely used in geriatrics and rehabilitation; the ICF provides a framework that situates self-care among the activity and participation domains of functioning.
History
Standardized ADL assessment emerged from mid-twentieth-century work on illness in older and chronically ill populations. Katz and colleagues introduced the Index of ADL in 1963, observing that recovery of self-care functions tends to follow an orderly hierarchy; Mahoney and Barthel published the Barthel Index in 1965 for rehabilitation populations; and Lawton and Brody extended assessment to instrumental activities in 1969, establishing the basic-versus-instrumental distinction still used today.
Key figures
- Sidney Katz
- M. Powell Lawton
- Florence Mahoney
- Dorothea Barthel
Related topics
Seminal works
- katz-1963
- lawton-1969
- mahoney-barthel-1965
Frequently asked questions
- What is the difference between basic and instrumental activities of daily living?
- Basic activities of daily living are fundamental self-care tasks such as bathing, dressing, and feeding, whereas instrumental activities of daily living are the more complex tasks needed to live independently in the community, such as managing finances, medications, and transportation.
- What does the Katz Index measure?
- The Katz Index of ADL rates independence in six basic self-care functions — bathing, dressing, toileting, transferring, continence, and feeding — and was designed as a standardized measure of biological and psychosocial function.