too much or too little urine needs medical attention. Polyuria is a condition of excessive production of urine (> 2.5 L/day), oliguria when < 400 mL are produced, and anuria being < 100 mL per day. Constituents About 91–96% of urine consists of water. The remainder can be broadly characterized into inorganic salts, urea, organic compounds, and organic ammonium salts. Urine also contains proteins, hormones, and a wide range of metabolites, varying by what is introduced into the body. The total solids in urine are on average per day per person. Urea is the largest constituent of the solids, constituting more than 50% of the total. The daily volume and composition of urine varies per person based on the amount of physical exertion, environmental conditions, as well as water, salt, and protein intakes. In healthy persons, urine contains very little protein and an excess is suggestive of illness, as with sugar. Organic matter, in healthy persons, also is reported to at most 1.7 times more matter than minerals. However, any more than that is suggestive of illness. However, it is important to note that lesser amounts and concentrations of other compounds and ions are often present in urination of humans. Color Urine varies in appearance, depending principally upon a body's level of hydration, interactions with drugs, compounds and pigments or dyes found in food, or diseases. Normally, urine is a transparent solution ranging from colorless to amber, but is usually a pale yellow. Usually urination color comes primarily from the presence of urobilin. Urobilin is a final waste product resulting from the breakdown of heme from hemoglobin during the destruction of aging blood cells. Colorless urine indicates over-hydration. Colorless urine in drug tests can suggest an attempt to avoid detection of illicit drugs in the bloodstream through over-hydration. Dark yellow urine is often indicative of dehydration. Yellowing may be caused by removal of excess riboflavin from the bloodstream. Certain medications such as rifampin and phenazopyridine can cause orange urine. Bloody urine is termed hematuria, a symptom of a wide variety of medical conditions. Dark orange to brown urine can be a symptom of jaundice, rhabdomyolysis, or Gilbert's syndrome. Black or dark-colored urine is referred to as melanuria and may be caused by a melanoma or non-melanin acute intermittent porphyria. Pinkish urine can result from the consumption of beets (beeturia) Greenish urine can result from the consumption of asparagus or foods,