The Geriatric Assessment: A Comprehensive Approach to Elder Care

The geriatric assessment is a structured, multidimensional evaluation designed to capture the full complexity of health in older adults — extending well beyond conventional disease-focused medical workups. This page covers its definition and scope, the step-by-step process through which it operates, the clinical scenarios where it applies, and the decision boundaries that determine when standard care ends and specialist assessment begins. Understanding this framework is central to how modern elder care is planned, delivered, and coordinated.

Definition and scope

A geriatric assessment — most formally designated a Comprehensive Geriatric Assessment (CGA) — is a diagnostic process that evaluates medical, functional, psychological, and social domains simultaneously. The British Geriatrics Society and the American Geriatrics Society (AGS) both recognize the CGA as the standard framework for identifying conditions that routine clinical visits frequently miss in adults aged 65 and older.

The scope of the assessment distinguishes it from a standard physical examination by addressing functional status, cognitive health, mental health, nutritional status, medication burden, and social support in a coordinated way. A geriatric assessment, as used in clinical practice and referenced in CMS quality reporting programs, is not a single test but a structured process executed by an interdisciplinary team.

The geriatric assessment framework addresses what geriatricians call the "geriatric giants" — falls, immobility, incontinence, and cognitive impairment — four problem clusters identified by British geriatrician Bernard Isaacs in the 1960s that remain foundational to assessment scope. For a broader orientation to the field, the home page of this resource provides a structured entry point to the full range of geriatric topics covered here.

How it works

A full CGA proceeds through discrete phases, each producing data that informs the next:

  1. Medical assessment: Review of all active diagnoses, comorbidity burden using validated tools such as the Charlson Comorbidity Index, and medication review for polypharmacy, which the AGS Beers Criteria identifies as a leading source of preventable adverse drug events in adults over 65.
  2. Functional assessment: Evaluation of Activities of Daily Living (ADLs) and Instrumental Activities of Daily Living (IADLs) using standardized instruments. The Katz ADL Index and the Lawton IADL Scale are the most widely cited in the clinical literature published by the Hartford Institute for Geriatric Nursing.
  3. Cognitive screening: Administration of validated tools such as the Mini-Mental State Examination (MMSE) or the Montreal Cognitive Assessment (MoCA), both referenced in cognitive screening protocols and in National Institute on Aging (NIA) clinical guidance.
  4. Psychological evaluation: Screening for depression using the Geriatric Depression Scale (GDS), a 30-item or 15-item instrument developed specifically for older populations.
  5. Nutritional screening: Use of tools such as the Mini Nutritional Assessment (MNA), which the ESPEN (European Society for Clinical Nutrition and Metabolism) recognizes as a validated instrument for identifying malnutrition risk.
  6. Social and environmental assessment: Evaluation of caregiver availability, housing conditions, transportation access, and social isolation risk.
  7. Goal-setting and care planning: Synthesis of findings by the interdisciplinary team — typically including a geriatrician, nurse, social worker, and pharmacist — into a care plan aligned with patient preferences and advance care planning.

The regulatory context for geriatrics shapes how CGAs are documented, billed, and quality-reported, particularly under Medicare Advantage and post-acute care settings governed by CMS.

Common scenarios

Three clinical scenarios generate the majority of formal CGA referrals in US practice:

Pre-surgical evaluation: Adults aged 75 and older undergoing elective surgery are frequently referred for CGA to assess frailty and predict postoperative risk. The American College of Surgeons and AGS jointly issued a 2012 guideline recommending preoperative CGA components for this population.

Transition from acute to post-acute care: Patients discharged from hospital to skilled nursing facilities or home health are evaluated through CGA to establish functional baselines and identify high-risk discharge factors. CMS Minimum Data Set (MDS 3.0) assessments in certified nursing facilities incorporate CGA-derived domains including cognitive performance scales and ADL functional scoring.

Outpatient frailty and complexity management: Older adults presenting with signs that an older adult should see a geriatrician — such as unintentional weight loss, repeated falls, or multimorbidity with 5 or more concurrent chronic conditions — are prime candidates for structured CGA in the outpatient setting.

Decision boundaries

The CGA is not universally indicated for all older adults. Clinical decision-making around when to deploy a full CGA versus a focused geriatric evaluation follows identifiable boundaries:

CGA is indicated when 3 or more of the following are present: age 80 or older, 3 or more active chronic conditions, polypharmacy involving 5 or more medications, evidence of functional decline on ADL screening, a positive frailty screen using an instrument such as the FRAIL Scale, or a history of falls in the preceding 12 months.

Focused geriatric evaluation (rather than full CGA) is appropriate when a single high-risk domain has been identified — for example, an isolated fall risk assessment or a targeted frailty assessment — without evidence of multidomain impairment.

Standard primary care remains appropriate when an older adult screens negative across cognitive, functional, and frailty domains and carries fewer than 3 active diagnoses without significant medication burden.

The contrast between CGA and standard care is not simply one of depth but of purpose: standard care addresses presenting complaints, while CGA systematically maps the total load of impairment, risk, and reserve capacity across an individual's biological, psychological, and social profile.

References

The law belongs to the people. Georgia v. Public.Resource.Org, 590 U.S. (2020)