Rap impresario Dr andre young jr dr dre . Dre 's 20-year - old son was found dead over the weekend in his Woodland Hills home , coroner 's officials said . TOXICOLOGY TEST ORDERED FOR DR . DRE 'S SON : Autopsy alone could not determine cause of death andre young jr .
Why are they testing the young man 's blood ?
Pick the best answer from the following options:
- For immunization purposes .
 - None of the above choices .
 - To determine a cause of death .
 - For a work drug - screen .


To determine a cause of death .