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.
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.