Athletes who compete in events sanctioned by, are members or license holders of a national governing body, or who fall under the USADA testing jurisdiction as defined in the USADA Protocol for Olympic and Paralympic Movement Testing, are subject to blood testing. Blood testing allows for the detection of additional substances that in some cases may not be able to be detected in urine. Additionally, blood samples allow for the use of longitudinal data collection, often called the biological passport. Longitudinal data collection monitors certain bio markers over time to detect the use of performance enhancing substances and/or methods.
This page outlines the in-competition testing process for a blood sample collection.