EDTA tube

An EDTA tube is a type of blood collection tube used in medical testing. It contains EDTA (ethylenediaminetetraacetic acid), a substance that binds calcium in blood, preventing clotting. This allows blood to stay in its liquid form, making it ideal for laboratory tests that analyze blood cells, blood counts, and other components. The tube typically has a lavender or purple cap and is used to ensure consistent, accurate testing results by preserving the blood sample until analysis.