What is the difference between a blue tourniquet and a yellow tourniquet?

While there may be exceptions for the most part yellow or tan colored tourniquets are made from latex and blue tourniquets are made from nitrile or similar synthetic. Latex Allergies can be severe and life-threatening so using a latex tourniquet on a latex-sensitive patient can have serious complications. That is why many healthcare providers have switched to non-latex alternatives which are usually blue.