Some drugs (such as rifampin) will color
urine (rifampin orange, for example), and abnormally colored
urine will give false readings on the dipstick labs, which rely on color for their interpretation.
Transparency: Turbid
Urine transparency (turbidity). Urine normally is clear. Semen, mucus, and lipid may cause turbidity in normal urine. Increased numbers of cells, crystals, casts, or organisms can increase the turbidity of urine in disease conditions.