What component of urine is 95% of its total composition?

The primary component of urine, making up approximately 95% of its total composition, is water. This high percentage reflects the essential role that water plays in the urinary system, as it serves as the solvent for various solutes and waste products that the kidneys filter from the blood. The remaining 5% comprises various substances, including electrolytes, urea, creatinine, and other metabolic waste products, but water remains the predominant constituent.

Understanding the composition of urine is critical in clinical settings, as it can affect urine specific gravity and give insights into hydration status, renal function, and possible metabolic disorders. This knowledge forms a foundational aspect of laboratory testing and interpretation for medical professionals.