Today Jeremy visited the nuclear medicine department at hospital for a GFR (Glomerular Filtration Rate) test to check his kidney function. A special dye was injected into a vein in his arm. A sample of his blood was taken from his central line at 2 hours, 3 hours and 4 hours after the injection, to measure how much dye was still in his blood. The GFR test shows how well his kidneys are working by measuring how quickly the dye is removed from his blood. Jeremy will have his kidney function monitored regularly during treatment, because some chemo drugs have the potential to affect kidney function.