Hemodialysis product (HDP) - is a number used to quantify hemodialysis and peritoneal dialysis treatment adequacy. It was proposed by Scribner and Oreopoulous because of their perceived inadequacy of the Kt/V measure of dialysis adequacy. The HDP is defined by the following empirical formula: HDP = t * f 2 Where: * HDP - hemodialysis product * t - dialysis time (hours/dialysis session) * f - dialysis frequency (dialysis sessions/week)