I will give you a bit of information about nephrotic syndrome. Hopefullly, someone who has personal experience will be along to offer your their insights.
Many Lupus patients also suffer from protein in the urine, but Lupus is not the only auto-immune disorder that can cause this syndrome. Nephrotic syndrome is caused by various disorders that damage the kidneys, particularly the basement membrane of the glomerulus. This then, causes abnormal excretion of protein in the urine. Nephrotic Syndrom can also be caused by an infection, the use of certain drugs, cancer, genetic disorders, or diseases that affect multiple body systems; including diabetes, lupus, multiple myeloma, and amyloidosis. It can also be a symptoms of kidney disorders, such as glomerulonephritis, focal and segmental glomerulosclerosis, and mesangiocapillary glomerulonephritis (a type of kidney disease caused by inflammation of the internal kidney structures (glomeruli), which help filter waste and fluids from the blood).
Doctors will usually want to run several tests to try to determine the cause of the syndrome. These tests include:Glucose tolerance test, Antinuclear antibody, Rheumatoid factor, Cryoglobulins, Complement levels, Hepatitis B and C antibodies, VDRL serology, Serum protein electrophoresis, or Kidney biopsy. The goals of treatment are to relieve symptoms, prevent complications and delay progressive kidney damage. If the syndrome is caused by an underlying disease, treatment is usually geared towards that underlying disease. Treatment usually consists of Corticosteroid, immunosuppressives, antihypertensive drugs, and diuretic medications. Antibiotics may be added to help to control infections. Angiotensin converting enzyme (ACE) inhibitors have been successful in reducing the amount of protein loss in the urine and are therefore frequently prescribed for treatment of nephrotic syndrome.
I hope that this was helpful
Peace and Blessings