I have always termed the lumens of a double lumen implanted port as medial and lateral. I work in outpatient infusion and the patients never know which lumen was last accessed. Sometimes the documentation will state left or right and no one knows if that is the nurses left/right or the patient's left/right. Currently, the EMR allows the nurse to choose lumen 1 and lumen 2 for documentation but that does not describe which is which and the documentation rarely is elaborate to ensure a clear picture. I having been working with nursing informatics in order to change the documentation choices to medial and lateral but am getting push-back. I cannot find a written reference to support my recommendations. Thank you in advance for your reply.