Urobilin - naturally occurring pigment in urine that produces the yellow color of urine. When urine is dense, the urobilin can create the appearance of an orange-red color whose intensity varies with its degree of oxidation, and sometimes causes pee to look red or bloody. It can be shown not to be blood on a dipstick test or a number of other blood tests.

Many urine tests (urinalysis) monitor the amount of urobilin in urine because it is an important substance in metabolism, production of urine. Urobilin levels can give insight on the effectiveness of urinary tract function. Normally, urine would appear as either yellow urine or white urine. The yellow in the urine is from the presence of urobilin. If there are too many chemicals in the urine, the appearance of the urine can darken and appear as cloudy urine in case of particles present in urine or simply orange urine in case of dehydration.

If the urine appears darker than just the common yellow color of urine, it may not necessarily be a bad thing. Sometimes during the night, the urine sits in the bladder for a long time and accumulates in density. The first urination of the day, which is usually during the morning, can produce a darker color of urine. Additionally, when a person is dehydrated, there is not enough water in the urine to mix in with the urobilin, and create a lighter color. In cases of dehydration, the urine can appear darker. Of course, urine can appear amber, brown, or red in case of blood being present in urine, which is a condition called Hematuria.

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