The test kit comes with an envelope which is already equipped with a shipping label. They can simply throw this into a mailbox.In summer, we recommend that you hand in your blood directly at the post office so that it is not exposed to the heat in the mailbox. As a result, the blood can become hemolytic and can no longer be evaluated.If your blood arrives hemolytically, we will automatically send you a new test kit. In this case, you will be informed in advance by e-mail.