Believe it or not! Scientists are currently working on a way to run do-it-yourself STD tests on your smart phones but it may involve from a drop of blood to urinating on your phone???

Doctors and technology experts are developing small devices, similar to pregnancy testing kits, that will tell someone quickly and privately if they have caught an infection through sexual contact.
People who suspect they have been infected will be able to put urine or saliva on to a computer chip about the size of a USB chip, plug it into their phone or computer and receive a diagnosis within minutes, telling them which, if any, sexually transmitted infection (STI) they have. Seven funders, including the Medical Research Council, have put 4m into developing the technology via a forum called the UK Clinical Research Collaboration.
May want to read more from the source: Mobile phone kits to diagnose STDs | Society | The Guardian