Have mild lupus. Urine dip showed moderate blood. Otherwise normal. I have also very well controlled interstitial cystitis. Should assume it's from the IC?

Hematuria. its to find out if the source of blood in urine is kidneys or bladder. You just ask for microscopic exam of urine. RBCs from kidney in the urine are deformed or form castes or rouleaux. It's not so if the source of those red blood cells is bladder.