This thesis aims to describe the process from theory to implementation. It also describes the results obtained from the process. The main goal of the project is to analyze the possibility of using reflectrometric pulse plethysmography to measure variations in oxygen saturation, heart rate and respiratory rate on other locations on the body than the traditional measurements on the finger. This process is done to investigate the possibility of using reflectometric pulse plethysmography in a multi sensor that might be located in the chest, back or head region of the body. Measurements performed with reflectometric PPG are shown to be promising when compared to transmissive PPG measurements, showing similar oxygen saturation and heart rate between control and measurement. The respiratory rate can be observed clearly in areas on the body with larger movements caused by respiration, but can be less accurate in other locations due to noise.