Postage stamp size testing kit

This is great, a postage stamp size, paper blood testing kit. One of the best parts is that it can be manufactured in quantity for about a penny a piece. One of the commenters had a really good idea about including it in bandages. That way you can perform tests as part of protecting a cut. The test results could indicate if you need to see a doctor. At that size, you could fill a tissue with 40 or so different tests that could all be checked at the same time.