Is there any sensor or Basis to make a sensor that can sense blood group?
well, how do you test for bloodtype. you need antibodies attached to something, then you put ur bloodsample on it. if it aggregates its not that bloodtype...
Maybe Health Insurance Cards contain this information?
well, how do you test for bloodtype. you need antibodies attached to something, then you put ur bloodsample on it. if it aggregates its not that bloodtype...
http://www.eng.monash.edu.au/news/shownews.php?year=2010&nid=20
So basically LAX I think may be there is some way to read the capacitance of that specially treated paper when the blood is dropped on it may be different types of blood groups react differently when coming under electric circuit due to different sort of antibodies or elements in them?
about differences between antibodies , circuit and detecting, i doubt that.
look at the strukture of an antibody 
the differences r that little difference in outer shape of antigens binding site. Also blood is a mixture of many different substances that may vary from person to person even if they have the same bloodtype.
rather then a small sensor, this is what i could imagine: an automation of the procedure. so like a device that puts a drop of blood somewhere and puts another in it and then performs tests for idk like viscosity or directs light through it or something like that and then washes away the blood for next sample.
idk, if you can buy something like that it will be like $$$$$$.
Nice! clarification LAX, can you put light on:
puts another in it
What needs to be inserted?
What needs to be inserted
another bloodsample
usually you would not take a another bloodsample but a purified version of blood (only antigens of) to mix with a bloodsample to check if it aggregates.
this is the "sensor" you need 
http://www.leinhardt.ch/immucor-immunhaematologie.html
i found in a german pdf, that testing for bloodtype would be done manually by hand because its faster then the machines, -in case of an emergency
maybe that helps, didnt watch it, but i think it shows bloodtestingstuff