ABSTRACT
Objective To discuss the factors that affect the examination of urine formed elements by IQ200 automated uri-nalysis analyzer causing false positive and look for the solution methods. Methods 2,319 urine samples were tested by IQ200 automated urinalysis analyzer and microscopy. The results were contrasted and the false positive reasons were ana-lyzed. Results When using IQ200 automated urinalysis analyzer,the false positive rate of red cell is 14.7%. Crystals,bac-teria,yeast like fungus sometimes are regarded as red cell by analyzer. The false positive rate of white cell is 15.75%. Small round cells,lots of bacterium can cause false positive; the false positive rate of cast is 38.58 % and viscose rayon is main agent. Conclusion Many factors can affect the examination in IQ200 automated urinalysis analyzer and cause false positive,so IQ200 can only be used for scanning,which is very important to observe sediments by microscopic examination when pathologic ingredients in urine are increased and at the same time all above interferences are positive and manifold.