Is there a needle in the sensor? How invasive is it? Laura 26 November 2020 17:41 Updated There is no needle in the device but a very thin filament sits just under the skin to measure interstitial fluid. Related articles How often should I get a new sensor? What's the sensor like and does it pierce the skin? What do I do after my two weeks are over? Can I shower and exercise with the sensor on? On Level 3, my target is to get less than 5 spikes. Why 5? Comments 0 comments Please sign in to leave a comment.