Subnormal intellectual functioning which originates during the developmental period. This has multiple potential etiologies, including genetic defects and perinatal insults. Intelligence quotient (IQ) scores are commonly used to determine whether an individual has an intellectual disability. IQ scores between 70 and 79 are in the borderline range. Scores below 67 are in the disabled range. (from Joynt, Clinical Neurology, 1992, Ch55, p28)

Descriptor ID	D008607
MeSH Number(s)	C10.597.606.643 C23.888.592.604.646 F01.700.687 F03.625.539
Concept/Terms	Intellectual Disability Intellectual Disability Disabilities, Intellectual Intellectual Disabilities Retardation, Mental Mental Retardation Disability, Intellectual Intellectual Development Disorder Development Disorder, Intellectual Development Disorders, Intellectual Disorder, Intellectual Development Disorders, Intellectual Development Intellectual Development Disorders Idiocy Idiocy Mental Retardation, Psychosocial Mental Retardation, Psychosocial Mental Retardations, Psychosocial Psychosocial Mental Retardation Psychosocial Mental Retardations Retardation, Psychosocial Mental Retardations, Psychosocial Mental Deficiency, Mental Deficiency, Mental Deficiencies, Mental Mental Deficiencies Mental Deficiency

Below are MeSH descriptors whose meaning is more general than "Intellectual Disability".

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Below are MeSH descriptors whose meaning is more specific than "Intellectual Disability".