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.
Normal: Pale to dark yellow. Abnormal: Many foods and medicines can affect the color of the urine. Urine with no color may be caused by long-term kidney disease or uncontrolled diabetes. Dark yellow urine can be caused by dehydration.Red urine can be caused by blood in the urine.bnormal: Many foods and medicines can affect the color of the urine. Urine with no color may be caused by long-term kidney disease or uncontrolled diabetes. Dark yellow urine can be caused by dehydration. Red urine can be caused by blood in the urine.