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Kaplan Qbank USMLE



Author10 Posts
  #1

A 6-year-old boy with mental retardation has recently been diagnosed with Fragile X syndrome. His 9-year-old sister appears to be of normal intelligence but has symptoms of attention deficit hyperactivity disorder (ADHD). What is the first test that is indicated in her work-up for ADHD?

A. EEG
B. Cytogenetic testing
C. MRI
D. Intelligence quotient (IQ) test
E. Urine for metabolic screen

  #2

b?

  #3

A.?

I was looking for information on lab tests used for diagnosing ADHD, and I couldn't really find anything. I thought ADHD was diagnosed more by history and by major and minor criteria which are more behavior oriented, rather than lab tests... correct me if I'm mistaken please.

I did read some information on checking T3 and T4 to rule out hyperthyroidism, but i'm not sure this is applicable for this question.


  #4

D. Intelligence quotient (IQ) test


  #5

IQ is what we do here.....kindly elaborate


  #6

I'd go for IQ testing also.

  #7

I'd go for D - TQ test .. after thorough History n clinical symptoms which resemble if for ADHD

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  #8

i would put D.

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  #9

the correct answer is IQ test, It's important to know if the kid has a real low IQ, or a major learning disability. It could be a clue that there is something else going on instead of ADHD. (by the way MRI is now being study as a very useful tool to Dx ADHD)


  #10

Hi Guys I forgot this q for a long time

The correct answer is
B. Cytogenetic testing should be performed on all sisters of males with Fragile X. Heterozygous females frequently have developmental and behavioral problems such as ADH

D. They may also have borderline or mild mental retardation.

An EEG (choice A) is likely to be normal, and unless there are signs or symptoms suggestive of a seizure disorder, it would not be indicated.

ADHD is a clinical diagnosis and no neuroimaging tests such as MRI (choice C) will be useful in making the diagnosis of ADHD.

IQ testing (choice D) may be helpful in school placement, but it is not the first test to be ordered.

Urine for metabolic screening (choice E) is used to detect rare inborn errors of metabolism. It would be indicated in cases of failure to thrive, seizures, and sepsis. Many inborn errors of metabolism are associated with severe mental retardation.









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