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Iron is heavy, and iron is a big part of red blood cells.  If your drop of blood floats on the chemical, it means that there is not enough iron in the blood to make it sink.  If you don't have enough iron, you are anaemic and should see your doctor to find out why.  

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Q: I went to donate blood and my blood was tested and I was told I could not donate because my blood floated when in was put in a chemical.What causes the blood to float when tested?
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