Recently, health becomes trend among people and interest in oxygen free radical got increased. BioDoctor is a product that can check individuals oxygen free radical levels without having to go to the hospital and also can store the test results and other data by using smart phone application. With rounded edges with soft shape and color provides friendly and clean image which can make you feel comfort even though you are using medical device. The compact size allows to increase portability and make it easier to store. To prevent the discomfort by using it with one hand when testing urine, BioDoctor can be easily hold with one hand with a concave surface. In order to avoid contamination due to urine is used to develop a separate cartridge.