DO (IQ) 3

Question 1

An osteopathic physician is evaluating a patient with an IQ of 55. Under DSM-5, this level of intellectual disability is classified as:

Accepted Answer

Moderate

Answer

DSM-5 classifies intellectual disability with IQ 35–49 as moderate, IQ 50–70 as mild, and IQ 20–34 as severe.

Question 2

A 4-year-old child cannot be reliably tested with standard IQ measures. Which assessment approach is most appropriate for evaluating intellectual functioning in this case?

Accepted Answer

Vineland Adaptive Behavior Scales

Answer

The Vineland Adaptive Behavior Scales assess real-world functioning and are appropriate when standardized IQ testing is not feasible or reliable.

Question 3

Which single gene disorder is the most common inherited cause of intellectual disability in males?

Accepted Answer

Fragile X syndrome

Answer

Fragile X syndrome, caused by CGG trinucleotide repeat expansion in the FMR1 gene on the X chromosome, is the most common inherited cause of intellectual disability.

Question 4

A standard score has a mean of 100 and SD of 15. What is the probability of randomly selecting an individual with an IQ between 85 and 115?

Accepted Answer

68%

Answer

Scores between 85–115 fall within one standard deviation of the mean (100 ± 15), encompassing approximately 68% of a normally distributed population.

Question 5

A physician is assessing an adult who sustained a traumatic brain injury. Pre-injury IQ is estimated using what method?

Accepted Answer

Word reading tests such as WTAR or NART

Answer

Word reading tests (e.g., WTAR, NART) estimate premorbid IQ because word reading is relatively preserved after brain injury.

DO - Doctor of Osteopathic Medicine Practice Test

DO - Doctor of Osteopathic Medicine Practice Test

DO (IQ) 3