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A blue top blood tube contains buffered sodium citrate(buff. Na citrate). This chemical has three main functions: 1) To prevent blood from clotting 2) To preserve the shape of red and white blood cells 3) To prevent platelets from clumping

Generally blue tubes are used for the following tests: Prothrombin Time (PT), Partial Thromboplastin Time (PTT/APTT) and International Normalized Ratio (INR).


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15y ago

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