Which of these is NOT normally found in urine?

Glucose is not normally found in urine under healthy physiological conditions. In a healthy individual, glucose is filtered by the kidneys but is effectively reabsorbed in the renal tubules. This reabsorption process allows the body to retain glucose, which serves as an important energy source. When blood glucose levels exceed a certain threshold—often due to conditions such as diabetes mellitus—glucose can spill over into the urine, resulting in glucosuria.

On the other hand, urea, creatinine, and water are all normal components of urine. Urea is a waste product formed from protein metabolism and is excreted in the urine as a means of removing nitrogenous waste from the body. Creatinine is produced from muscle metabolism and is generally excreted in a consistent manner, making it useful for assessing kidney function. Water is the primary solvent in urine, making up the majority of its composition and assisting in the transport of waste products for excretion.