In this paper,the effects of pipette tip with or without rinsing on the determination of newcastle disease antibody was studied. Thirty samples of sera from chickens were taken to be tested and the antibody titer of newcastle disease was determined by the hemagglutination test(HA)and hemagglutination inhibition(HI)test method in Newcastle disease diagnostic technique(GB/T 16550-2008).The same sample was tested with a pipette tip rinsing three times or without rinsing.The results showed that there was 0-1 ti...