The EasySep™ Human Extracellular Vesicle (CD81) Positive Selection Kit isolates highly purified human extracellular vesicles from plasma/serum and cell culture conditioned medium by immunomagnetic positive selection. Extracellular vesicles are labeled with Tetrameric Antibody Complexes recognizing CD81 and magnetic particles. Labeled extracellular vesicles are separated without columns using an EasySep™ magnet. Unwanted biofluid components are simply poured off, while desired extracellular vesicles remain in the tube. Isolated extracellular vesicles are available for downstream applications such as DNA/RNA extraction, Western blot, or mass spectometry.