In this installment of Sample Prep Perspectives, Norwegian authors from the University of Oslo describe the practical aspects of hollow fiber liquid-phase microextraction in the three-phase mode (HF3 LPME). The guest authors highlight important practical issues related to the supported liquid membrane, the hollow fiber, and the extraction itself. They also discuss practical work with electromembrane extraction (EME), which is related to HF3 LPME but uses an electrical potential as the driving force for the extraction