What condition is orthostatic proteinuria associated with?

Orthostatic proteinuria is a condition characterized by the presence of excess protein in the urine when a person is in an upright position, which typically resolves when the individual is lying down. This phenomenon is often related to a change in body position, as the gravitational shift when standing can affect kidney function and the filtration process.

In individuals with orthostatic proteinuria, protein levels in the urine are usually significantly higher when the person is standing, while remaining within the normal range when supine. This condition is frequently observed in adolescents and young adults, and it is often benign, resolving as the individual matures.

While factors such as ambulatory status, dietary influences, and hydration levels can impact urine composition and output, they do not specifically define orthostatic proteinuria as primarily as the change in body position does. This is why the correct answer highlights the association of orthostatic proteinuria with changes in the body’s posture.