When a urinalysis result shows positive 3 what does it mean?

There are several components to a urinalysis such as specific gravity, pH, leukocyte esterase, protein, glucose, nitrite, bilirubin, urobilinogen, blood and a microscopic analysis including white blood cells, red blood cells, bacteria, epithelial cells, etc. A urinalysis can be used to diagnose anything from kidney stones to pyelonephritis so in order to know what positive 3 means, you will have to know which component showed the result.