Abstract: Objective To evaluate two quality control modes of sputum smear in Urumqi. Methods The sputum smears from the laboratories of seven districts and one county were selective- ly examined by different quality control modes with same content once a quarter.Results The pos- itive rate and the accordant rate of quality control in double grade quality control mode were signifi- cantly lower than those in single grade quality control mode.Conclusions The communication and study were increased among laboratories,the objectivity and authenticity were improved by double grade quality control mode.The untrue sputum smear could be reduced by single grade quality con- trol mode.

Key words: Mycobacterium tuberculosis, Quality control mode, Sputum smear