We have been asked by the Nephrologist to start flushing PICCs and Â triple lumens with Citrate. I am not familiar with Citrate. How much? How ofter? Our response is "to just flush with NS if the patient can not receive Heparin." However, the doctor has asked us to develop a policy and procedure for flushing catheters withÂ Citrate. Please help! Thanks so much.