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The extra red blood cells make your blood thicker than normal. As a result, blood clots can form more easily. These clots can block blood flow through your arteries and veins, which can cause a heart attack or stroke. Thicker blood also doesn't flow as quickly to your body as normal blood.
What your results mean Clotting too slowly. Blood that clots too slowly can be caused by: Blood-thinning medications ; Liver problems; Inadequate levels of proteins that cause blood to clot; Vitamin K deficiency; Other substances in your blood that hinder the work of clotting factors; Clotting too fast. Blood that clots too quickly can be caused by: