Proteinuria could be measured by 24-hour urine collection. Urine protein above 3.5 g/day is considered as<unk>  range proteinuria. Diagnostic study of choice for<unk><unk>  is kidney biopsy that reveals the exact type of disease and the its progression.
Nephrotic syndrome diagnostic study of choice
Lupus nephritis diagnostic study of choice
Nephrotic syndrome echocardiography or ultrasound
Interstitial nephritis diagnostic study of choice
Acute kidney injury diagnostic study of choice
Membranous glomerulonephritis diagnostic study of choice
Rapidly progressive glomerulonephritis diagnostic study of choice
Hypertensive nephropathy other diagnostic studies