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Non-vacuum blood collection tubes are used in medical settings to collect blood samples for various laboratory tests. The EDTA K3 (ethylenediaminetetraacetic acid) additive in these tubes prevents blood clotting, making them ideal for hematological testing such as complete blood counts (CBCs). Non-vacuum design: Unlike traditional vacuum tubes, these tubes do not have a built-in vacuum to draw blood. Instead, they require the use of a syringe to manually collect the blood.