The process starts off like most pregnancy tests. You pee on a stick, specifically the absorbent test strip at one end. But everything's different after that first step. Remove the cap from the other end of the stick (cleverly provided to keep you from accidentally contaminating the wrong end) to reveal the USB connector. Pop it in your computer. The power from your USB port starts the electrospray ionization process, creating a spectrograph of the various masses for your analysis.