Orthostatic albuminuria is a medical condition that refers to the presence of albumin (a protein) in the urine when a person is standing up but not when lying down. Some possible synonyms for this condition could include postural albuminuria, positional albuminuria, or upright proteinuria. These terms all describe the same phenomenon of protein in the urine only when standing up, which can indicate a problem with the kidneys or urinary system. Other related terms might include orthostatic proteinuria, which is a more general term for protein in the urine related to changes in position, or orthostatic hypotension, which refers to drops in blood pressure when standing up.