No worries, I'd hate for you to pay for something you don't need to. The site's purchase you're referring to is if you had not seen a doctor and wanted blood tests at your own discretion to be done, they would order the tests through LabCorp and provide you the paperwork/results. Think of your doctor as that site; your doctor already ordered the lab tests and gave you the paperwork, therefore a site/organization like Health Testing Centers is unnecessary. To answer your second question, yes it is as simple as taking the paperwork you already have to LabCorp, handing it to them and paying whatever they ask. Do not pay anyone but LabCorp for these tests, unless of course you've already paid for the labs through your doctor (which you would have paid when you obtained the lab paperwork during your visit). Avoid that website you posted, it's worthless to you.