The ELISA (enzyme-linked immunosorbent assay) is a test which uses color change and antibodies to identify a substance. An indirect ELISA is one of three ELISA tests.
Urine varies in appearance, depending principally upon a body's level of hydration, as well as other factors. Normal urine is a transparent solution ranging from colorless to amber but is usually a pale yellow. In the urine of a healthy individual the color comes primarily from the presence of urobilin.
What is Normal Urine. It is always a good idea to keep a tab when you pee. Normal one indicates that all is well with the body. Any underlying conditions like an infection, proteinuria, diabetes or hypertension can be indicated by the appearance of your pee.sually, it appears pale or light yellow. The yellow tint of the pee is due to presence of the substance called urobilin. Urobilin, is a waste product that is formed after the breakdown of heme in the hemoglobin. This occurs during the destruction of old blood cells within the body.