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  • Clinical scales designed to weigh the amount of blood drawn from a donor. These scales usually consist of a weighing mechanism and some type of arrangement for automatic cutoff of blood flow when the correct weight of blood has been withdrawn (e.g., trip balance); their capacity is typically 1 kg (2.2 lb), with 5 to 10 g (0.0125 to 0.025 lb) accuracy. Blood collection scales are mostly used in blood banks to weigh the blood drawn from a donor as it is filling a plastic bag; some of them are portable and can be mounted on a pole. Some of these scales are part of a blood mixer, which is capable of weighing and mixing blood with an anticoagulant simultaneously.
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