▁have ▁these ▁mut ations . ▁ ▁M emb ran ous ▁gl omer ul one ph rit is ▁The ▁inc idence ▁of ▁R V T ▁in ▁people ▁with ▁Ne ph rot ic ▁synd rome ▁ranges ▁from ▁ 5 % ▁to ▁ 6 5 %. ▁Ne ph rot ic ▁synd rome ▁is ▁caused ▁by ▁memb ran ous ▁gl omer ul one ph rit is , ▁minimal ▁change ▁disease , ▁and ▁foc al ▁segment al ▁gl omer ulos cl eros is . ▁ ▁Di agn osis ▁ ▁There ▁are ▁no ▁labor atory ▁tests ▁used ▁to ▁diagn ose ▁R V T . ▁ ▁Ob ser ving ▁the ▁patient ' s ▁sympt oms , ▁medical ▁history ▁and ▁imag ing ▁remain ▁the ▁fundamental ▁source ▁for ▁diagn osing ▁R V T . ▁Im aging ▁is ▁used ▁to ▁detect ▁the ▁presence ▁of ▁a ▁blood ▁cl ot . ▁In ▁an ▁ab normal ▁kid ney ▁with ▁R V T , ▁a ▁blood ▁cl ot ▁is ▁present ▁in ▁the ▁ren al ▁ve in . ▁In ▁cases ▁where ▁the ▁ren al ▁ve in ▁is ▁suddenly ▁and / or ▁fully ▁blocked , ▁the ▁kid ne ys ▁will ▁en large , ▁reaching ▁its ▁maximum ▁size ▁within ▁a ▁week . ▁ ▁An ▁ul tras ound ▁imag ing ▁can ▁be ▁used ▁to ▁observe ▁and ▁track ▁the ▁size ▁of ▁the ▁kid ne ys ▁in ▁R V T ▁patients . ▁Ul tras ound ▁is ▁not ▁efficient ▁for ▁use ▁in ▁detect ing ▁blood ▁flow ▁in ▁the ▁ren al ▁ve ins ▁and ▁ar tery . ▁Instead ▁a ▁color ▁do pp ler ▁ul tras