Orthostatic proteinuria (synonyms: orthostatic albuminuria, postural proteinuria) is a benign condition. A change in renal

hemodynamics Hemodynamics or haemodynamics are the dynamics of blood flow. The circulatory system is controlled by homeostatic mechanisms of autoregulation, just as hydraulic circuits are controlled by control systems. The hemodynamic response continuously mo ...

, which in some otherwise normal individuals, causes protein (mostly

albumin Albumin is a family of globular proteins, the most common of which are the serum albumins. All the proteins of the albumin family are water-soluble, moderately soluble in concentrated salt solutions, and experience heat denaturation. Albumins ...

) to appear in urine when they are in the standing position. Urine formed when these individuals are lying down is protein-free. There is normal urinary protein excretion during the night but increased excretion during the day, associated with activity and upright posture. Total urinary protein excretion may be increased but levels above 1 g per 24 hours are more likely to be associated with underlying

renal disease Kidney disease, or renal disease, technically referred to as nephropathy, is damage to or disease of a kidney. Nephritis is an inflammatory kidney disease and has several types according to the location of the inflammation. Inflammation can b ...

. The exact cause for orthostatic proteinuria is not known.

References

{{reflist Nephrology