Whenever there is a 50% drop in glomerular filtration over 3 months we are in the presence of what is defined as rapidly progressive deterioration of renal function. If it is also accompanied by an active urinary sediment. it is inferred that one of these may be taking place: a rapidly progressive glomerulonephritis. a thrombotic microangiopathy. https://www.roneverhart.com/Mizuno-Prospect-GXC105-Youth-Catcher-s-Mitt/