Pre-analytical Influences on a Blood Test Study

"Three blood samples to be taken at 08.00, 10.00 and 12.00 on day 1 of the study.~The following day, after an overnight fast, a blood sample will be taken at 8.00, followed by a standardized breakfast provided by the study team at 8.30, and then two further blood samples at 10.00 and 12.00."

C4 will be measured in surplus serum from 30 adult lipid patients before starting on lipid-lowering therapy (either statin of PCSK9 therapy) and then again 3 months after starting on therapy. Blood samples will be collected as part of routine lipid management, no additional samples are required.