A client who is receiving an IV infusion of heparin sodium 25,000 units in 5% dextrose injection 500 mL at 1,000 units/hour has a partial thromboplastin time (PTT) of 10 seconds. The sliding scale prescription reads, "If the PTT is less than 65 seconds, increase the rate by 200 units/hour; and if the PTT is greater than 95 seconds, decrease the rate by 200 units/hour." The nurse should regulate the infusion pump for how many mL/hour? (Enter numerical value only.)