Abstract: Objective　To investigate the application value of iQ200 automated urinary sediment analyzer in detection of cast.  Methods　A total of 76 samples detected by iQ200 analyzer with cast positive result were amended by the image and were affirmed by manual microscopy. Results　Among the 76 samples， 57 were positive after amendment， and 52 were positive after affirmation by manual microscopy. The false positive rate of the results detected by iQ200 analyzer before amendment was 31.58%， and then was 8.77% after amendment according to the results detected by manual microscopy.  Conclusions　The false positive rate of iQ200 analyzer is high because of the limit of detection principle and technology and the interference by other components in urine. When cast is found in urine by iQ200 analyzer， the image information should be checked again, and the microscopy should be used for affirmation and classification. 

Key words: Urinary sediment analyzer, Cast, Microscope, Image