The liquid between your cells accounts for around a quarter of all of your bodily fluid. A patch consisting of tiny needles could monitor this liquid to check for health conditions like diabetes
Source:
https://www.newscientist.com/article/2260866-the-fluid-in-between-your-cells-could-help-reveal-health-problems/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home