Early diagnosis can improve your chances of survival massively, and is also a big opportunity to new technology to help as shown in the Nokia Sensing XCHALLENGE entries.
Hopefully one day (and not some distant time in the future) you will be able to be quickly scanned for a wide variety of diseases and infections - hundreds of times more than could realistically be considered by a GP considering general symptoms such as fever, nausea and pain - of course they have to assume its the most common ailments first so could be months before all the other possible causes are tested for and discounted.
Nokia Sensing XChallenge - XPrize
Qualcomm Tricorder XPRIZE - http://www.qualcommtricorderxprize.org/
Scanadu Scout Medical Tricorder indiegogo project - http://www.indiegogo.com/projects/scanadu-scout-the-first-medical-tricorder?c=home
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