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