Report Abuse. The colors on the urine testing strip indicate the different concentrations of sugar in the urine. for example, the dark brown shade indicates highest concentration(++++),whereas light blue indicates nil sugar in the urine.There are other shades inbetween indicating 1/2,1,1 1/2 percent sugar.eport Abuse. The colors on the urine testing strip indicate the different concentrations of sugar in the urine. for example, the dark brown shade indicates highest concentration(++++),whereas light blue indicates nil sugar in the urine.There are other shades inbetween indicating 1/2,1,1 1/2 percent sugar.