Bests & Worsts Reviews from Amazon

This blood test works perfectly. I now know that I'm O+. I read a couple other reviews though that really had me scratching my head. This product works- the only reason it won't work is if you don't read the directions. One person on here posted a picture of her cards, in which none of the circles reacted, and claimed her card was faulty. Well, if they had read the directions, they would have known that that means their blood type is O-. I feel like it's wrong to judge this product based on reviews from people that can't follow SIMPLE directions or choose not to read them entirely. This is a great product and will work if you follow instructions.