|V62.89||Borderline Intellectual Functioning||IQ 71-84|
|317||Mild Mental Retardation||IQ 50-55 to approximately 70|
|318.0||Moderate Retardation||IQ 35-40 to 50-55|
|318.1||Severe Mental Retardation||IQ 20-25 to 35-40|
|318.2||Profound Mental Retardation||IQ below 20 or 25|
In this manner, what is the main cause of mental retardation?
trauma before birth, such as an infection or exposure to alcohol, drugs, or other toxins. trauma during birth, such as oxygen deprivation or premature delivery. inherited disorders, such as phenylketonuria (PKU) or Tay-Sachs disease. chromosome abnormalities, such as Down syndrome.
What is the most common genetic cause of mental retardation?
Fragile X syndrome is the most common inherited form of mental retardation and, after Down syndrome, the most common genetic form. It is X linked, with dominant inheritance, and the penetrance is lower in females.
What is the most common level of mental retardation?
A cause has been identified for 70% of individuals with severe or profound mental retardation and for 24% with mild mental retardation. Fragile X syndrome, also called X-linked mental retardation, causes developmental delays in male maternal relatives and is the most common inherited form of mental retardation.
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