Every test that you complete as part of the ADNI4 study is done free of charge. You do not need to have health insurance to be part of the ADNI4 study. If you do have health insurance, they will not be billed for any of the tests you complete related to the ADNI4 study. If you are invited to visit a Quest lab and provide a blood sample, there will be no cost to you. You do not need to have health insurance or provide any payment to Quest for the blood draw. If you do provide a blood sample you may be compensated up to $70 for your time. We may reach out to you by email or phone every 2 years to ask you to repeat the blood draw. If you provide additional blood samples in the future you will again be provided a $70 eGift Card.