Final answer:
Orthostatic proteinuria is a physiological condition where protein is present in the urine when a person is in an upright position, but not when lying down. This can occur during pregnancy or due to vigorous exercise. To test for orthostatic proteinuria, a person needs to collect their urine in both lying down and standing positions and check for the presence of albumin in each sample.
Step-by-step explanation:
Orthostatic proteinuria is a condition where protein is present in the urine when a person is in an upright position, but not when lying down. This is a physiological condition and not a disease. It can occur during pregnancy or due to vigorous exercise.
To test for orthostatic proteinuria, a person needs to collect their urine in both lying down and standing positions, and then check for the presence of albumin in each sample. If albumin is present only in the standing sample, then orthostatic proteinuria is confirmed.