submit 10 mL (5 mL min.) aliquot of 24 hour Peritoneal Dialysate Fluid in a sterile screw capped container at 0 hour, 2 hour, 4 hour, overnight & 24 hour intervals AND 10 mL (5 mL min.) aliquot of 24 hour Urine in a sterile screw capped container AND 2 mL (1 mL min.) Serum from 1 SST AND 2 mL (1 mL min.) Plasma from 1 Grey Top (Sodium flouride) tube. Ship refrigerated. DO NOT FREEZE.