6 year ago.i test dtp renogram showes lft kidny 15% and right 85% fuctioning..and gfr 81 ml.3 month ago.a.i got anther dtp scan.that shows lft 15% and right 85% gfr 81 ml..and my creatine 0.9 mg.and uria 18.mg.from last 1 month when i urination noraml tike in in comde.it become fomy and disapear after 1-2min.but when i drink too much drink water no foam formation.for this problem 3 day ago i got a rutine urin test  thare is no albumin.glouse.bile salt.and puss cell.specific gravity 1.015.why urin is foam?is it normal???.i Am now 23 years my bp is 140/90