we usually find protein,urea ,uric acid and some chemical like potassium,calcium,manesium ect...
urea
The most logical answer would be urine, and it is!
The two main substances found in urine are water and waste products, such as urea, creatinine, and uric acid.
urea
acetone
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.
Benzodiazepines: up to 6 weeks with high level use Urine sample results are usually reported as positive (substance is found) or negative (no substance is found).
Urea is a substance found in the filtrate that is reabsorbed by the kidneys and is present in urine. It is a byproduct of protein metabolism and is filtered out of the blood during the formation of urine. While some urea is reabsorbed back into the bloodstream, a significant portion remains in the urine, contributing to its composition. Additionally, other substances like creatinine and various ions can also be present in urine following filtration and reabsorption processes.
Phosphorus was the element found in the urine of a scientist named Hennig Brand in 1669. Brand had been trying to extract gold from urine by boiling it down until he obtained a glowing substance, which turned out to be phosphorus.
blood
Urine.