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Flowchart showing different temperature and time exposure of blood samples collected from group A and B subjects in various types of tubes. Blood collected in various types of tubes were exposed to different temperatures and time. After exposures serum was separated from SST tubes, plasma was separated from fluoride tube, blood from EDTA tube was used directly for haemoglobin and HbA1c measurement and hemolysate was prepared from EDTA blood for folate measurement.
