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 color urine is normal. Everyone has a different ânormalâ when it comes to the color of urine. This norm should fall on the yellow spectrum, though. The amount of water you drink influences whether the color is a pale yellow or a dark amber.