Physiology Glomerular Filtration, Renal Blood Flow, and Their Control 88efd8e2 Two substances that can probably be used to determine filtration fraction are - A Insulin and mannitol B Urea anddiodrast C PAH and phenol red D Inulin and PAH High-Yield Explanation Ans. is 'd' i.e., Inulin and PAH o GFR is measured by inulin and renal plasma flow is measured by PAH.