Cognitive Reflection Test (CRT) Practice

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Test your cognitive skills with the Cognitive Reflection Test. Practice with challenging questions that test reflex and intuition. Improve your decision-making abilities and get ready for the CRT!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

Which lab test could help identify Alzheimer's disease?

Complete blood count
Apolipoprotein E4 (APOE 4) testing
Liver function tests
Thyroid function tests

The correct answer is: Apolipoprotein E4 (APOE 4) testing

Apolipoprotein E4 (APOE 4) testing is significant in identifying Alzheimer’s disease because the presence of the APOE ε4 allele is associated with an increased risk of developing the disease. Individuals who carry one or two copies of this allele have a higher likelihood of experiencing cognitive decline and developing Alzheimer’s compared to those who do not have the gene variant. While this test is not definitive for diagnosing Alzheimer’s, it can indicate a predisposition to the disease, especially when combined with other clinical assessments and imaging studies. In contrast, the other tests listed do not specifically target Alzheimer's disease. A complete blood count is primarily used to assess overall health and detect various disorders, but it does not provide information relevant to diagnosing Alzheimer’s. Liver function tests evaluate liver health and do not pertain to cognitive disorders. Thyroid function tests assess how well the thyroid is working and might help rule out other causes of cognitive impairment but are not specific indicators for Alzheimer's disease itself.