Since there are many comparisons between PCS, CTE, and Alzheimer's Disease, here is some more information.

You might want to consider this information from the National Institute on Aging: https://www.nia.nih.gov/alzheimers/p...ics-fact-sheet

APOE ε4 occurs in about 40 percent of all people who develop late-onset AD and is present in about 25 to 30 percent of the population. People with AD are more likely to have an APOE ε4 allele than people who do not develop AD. However, many people with AD do not have an APOE ε4 allele.

A quality genetic test costs about $400. If genetic testing is sought, be sure to ask if the test can identify APOE ε4 with a high level of accuracy.