United Hospital observed World Kidney Day in befitting manner by conducting free health checkups and announcing the launch of Haemodiafiltration and Bio Impedance for dialysis patients yesterday. Haemodialysis in-charge Dr Dewan Nabidur Rahman said, ''Haemodiafiltration and Bio Impedance will soon be added for dialysis patients who needs checkup every three months or so.'' Consultant Dr Tanveer Bin Latif said, "Haemodialysis is a treatment management system which requires technical expertise that will be provided by the hospital". In the afternoon, a scientific seminar was also organized to mark the day.