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Blood is often collected in what capillary tubes rather than plain capillary tubes to prevent clotting of the blood
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Blood is often collected in what capillary tubes rather than plain capillary tubes to prevent clotting of the blood

User Florian Burel
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The blood is collected in heparinized capillary tubes to prevent clotting. Heparin is a blood thinner and this anticoagulant is produced naturally by mast cells and basophils. But heparin can not dissolve or break the preformed clots. 
User Andrew Vilcsak
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