Diagnostic assessment is usually going to focus on two major areas: intellectual functioning and adaptive functioning. There will also be a focus on whether these two major areas had deficits or impairments during the developmental period. This can be done with a record review, interviews, and psychological testing (such as intelligence testing).
I think some of the causes are genetic/chromosomal and others often relate to prenatal factors. Disease, toxic exposure, infection, and malnutrition have all been shown to be causative for intellectual disability.
Diagnostic assessment is usually going to focus on two major areas: intellectual functioning and adaptive functioning. There will also be a focus on whether these two major areas had deficits or impairments during the developmental period. This can be done with a record review, interviews, and psychological testing (such as intelligence testing).
I think some of the causes are genetic/chromosomal and others often relate to prenatal factors. Disease, toxic exposure, infection, and malnutrition have all been shown to be causative for intellectual disability.