UFC athletes who are subject to testing by USADA can be selected at any time and at any location for 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.