How does the service work? Hollie 23 December 2020 17:07 Updated We have 4 different ways of collecting a blood sample. Learn more here about how the service works. Related articles How long do I have to take my test? How should I post my sample back? Can I order a test for someone else? I need help choosing a test How do I take a finger prick sample? Comments 0 comments Article is closed for comments.