Medical personnel will send the drawn blood to various examination instruments, because different tests need different blood in the tube, after waiting for the results to come out for review, if the results are considered to have obvious abnormal indicators, the remaining blood needs to be tested again to determine whether the patient’s indicators are abnormal or experimental errors. When the results are reported, the residual blood or as medical waste will be sent to a special place for harmless treatment, its cannot be casually disposed of as ordinary garbage, otherwise if there are infectious diseases within it, or special bacteria and viruses, there will be the risk of contamination all around. So some tests can only be done in higher-level testing centers or hospitals, is to prevent biochemical contamination, such as the current new coronavirus monitoring, you need to have the appropriate test qualification, otherwise it will cause the leakage of viruses.