Abstract: Objectives　To explore the effects of gross hematuria on the results of several parmeters in laboratory urine examination. Methods　Eighty (80) children with IgA nephropathy and 40 cases with acute post-streptococcal glomerulonephritis hospitalized in our hospital from January 2014 to December 2015 were recruited. The ratio of urinary calcium and protein to creatinine, quantitative test of 24 h urinary calcium and protein, quantitative test of 24 h urinary albumin, α1-microglobulinuria, microalbuminuria and urine protein electrophoresis were tested during and after the gross hematuria, respectively. Results　The ratio of urinary calcium and protein to creatinine, quantitative test of 24 h urinary calcium and protein were much higher in the duration of gross hematuria as compared to those after the duration of gross hematuria, while α1microglobulinuria, microalbuminuria and quantitative test of 24 h urinary albumin showed no difference between the two periods. Conclusions　Gross hematuria could increase the level of urinary calcium and protein, while quantitative test of 24 h urinary albremin is not affected.