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Protein nor sugar should not be found in the urine of a healthy person.
Healthy urine consists of water, ammonia, potassium, hydrogen, little sodium, little creatine, little uric acid and urea and little bilirubin, if any of these substance is present in too much (or to little) quanity then it becomes unhealthy. Also if glucose and/or RBC are found in urine it is unhealthy.
urea
The amount of protein in your urine that is healthy varies from person to person. Some healthy people spill protein in their urine regularly. Talk with your health care provider for advice specific to your situation.
The most logical answer would be urine, and it is!
Ammonia
urea
In a healthy person, water, urea, and a small amount of electrolytes like sodium and potassium should be found. What should NOT be found are red or white blood cells, bacteria (yes, urine should be sterile), or nitrites or esterases which indicate an infectious processes.
acetone
Controls are used as a healthy sample to compare another person's urine test to. Knowing what is healthy helps doctors to see what is unhealthy.
The amount of substance that exceeds the tubular maximum will be found in the urine.
Uric acid is a by product of protein digestion and can be found in the urine.