Functional assessment
Read the topic background here, then explore the labeled visual and structured learning explanations on this page.
Read explanation on this page ↓ See diagram ↓Global Assessment of Functioning — on-site reading
This reference extract addresses Global Assessment of Functioning, a related subject. It does not cover every part of Functional assessment.. The article introduction is reproduced here, so you do not need to leave MedAtlas to read it. It may not match the latest official medical guidance.
The Global Assessment of Functioning (GAF) is a numeric scale used by mental health clinicians and physicians to rate subjectively the social, occupational, and psychological functioning of an individual, i.e., how well one is meeting various problems in living. Scores range from 100 (extremely high functioning) to 1 (severely impaired).
The scale was included in the Diagnostic and Statistical Manual of Mental Disorders (DSM) version 4 (DSM-IV), but replaced in DSM-5 with the World Health Organization Disability Assessment Timetable (WHODAT), a survey or interview with detailed items. The WHODAT is considered more detailed and objective than a single global impression. The main advantage of the GAF is its brevity.
How this connects to MD Physical Medicine and Rehabilitation
The digestive and hepatobiliary systems coordinate motility, secretion, absorption, metabolic processing and transport through anatomically distinct compartments. Functional, inflammatory, obstructive, infectious and neoplastic mechanisms can produce overlapping symptoms; accurate localization and context are needed for interpretation.
Text credit: Wikipedia contributors, “Global Assessment of Functioning”, original article · authors & revision history · CC BY-SA 4.0. Unmodified opening extract, accessed 24 September 2026. This Wikipedia-derived section is provided under CC BY-SA 4.0; the independent MedAtlas notes and design are separate works.
Functional assessment · visual study map
Scalable vector illustration. Labeled conceptual map, not a precise anatomical, histological or diagnostic image.The wording in this learning map is adapted from the attributed Wikipedia background section below (CC BY-SA 4.0).
What the underlying subject studies
At postgraduate and higher-specialty level, begin with normal anatomy and physiology of the relevant organ system, then compare distinct disease mechanisms, their evidence base and the limitations of available investigations.
How mechanisms and evidence connect
Advanced study requires evidence appraisal, multidisciplinary interpretation and a clear distinction between established facts, hypotheses and research findings. Procedural, diagnostic and prescribing skills must be learned under an accredited program.
How to develop a sound explanation
Identify the scope of this topic within the named specialty, connect it to the applicable patient population and formulate a structured question that can be answered using current specialty literature and supervised teaching.
References and verification (optional)
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