What is in urine?

• A. Roughly 70% water
• B. Roughly 80% water
• C. Roughly 95% water
• D. Roughly 60% water

Answer: (C)

Urine is primarily a watery fluid. In a healthy person, about 95% of urine is water, with the remaining roughly 5% made up of dissolved waste products and electrolytes. The main dissolved substances are urea (the major nitrogenous waste from protein breakdown), creatinine, uric acid, and electrolytes such as sodium, chloride, potassium, phosphate, and sulfate, along with small amounts of other metabolites. Hydration status, diet, and kidney function can change how concentrated urine is, but water stays the dominant component. That’s why the correct answer reflects roughly 95% water. The other options underestimate the water content and don’t match typical urine composition.