Urine protein 3+ may be associated with the Nutcracker phenomenon. Urine protein 3+ may also be related to physiological factors such as strenuous exercise, high fever, and may be caused by pathologic reasons, such as acute nephritis, nephrotic syndrome, diabetic nephropathy, and so on.
The left renal vein travels between the abdominal aorta and the superior mesenteric artery. Nutcracker syndrome occurs when the angle between the two decreases or when the superior mesenteric artery starts at a lower point and compresses the left renal vein. Compression of the left renal vein leads to an increase in glomerular protein filtration, and proteinuria occurs when the filtered protein exceeds the tubular reabsorption capacity.
Generally the amount of proteinuria due to left renal vein compression in patients with Nutcracker syndrome fluctuates, ranging from (-) to (++++). Thus urine protein 3+ may be due to Nutcracker syndrome.
Urine protein 3+ indicates a high level of urinary protein, which, in addition to being caused by Nutcracker syndrome, may be related to physiological factors such as strenuous exercise and high fever, and may also be caused by pathologic reasons, such as acute nephritis, nephrotic syndrome, diabetic nephropathy, and so on.
There are more causes of urinary protein 3+, patients are advised to consult the hospital in time and follow the doctor’s instructions for further examination and treatment.