Something I would add under Intrarenal is the important step of looking at the UA for protein, RBCs, WBCs. If proteinuria is present then it could suggest glomerular damage. Check urine Pr/Cr ratio to quantify it. >3.5 g/day is nephrotic range. If there is hypoalbuminemia and anasarca then criteria for nephrotic syndrome is met. Note that urinalysis only detects albumin (glomerular damage) whereas if you suspect a paraproteinemia you will need to get a urine Pr/Cr to see it.