Peritoneal dialysis (PD) is a form of dialysis that uses the lining of your abdomen to filter waste from your blood. PD is done at home. It gets its name from the lining of your abdomen, which is called the peritoneum. This lining is a membrane that surrounds the space called the peritoneal cavity. It’s a miracle of the human body that this natural lining can be used to filter your blood.