Fresenius Nurse Practice Test

Color coding lines helps you quickly identify the path of blood in the dialysis circuit. The arterial bloodline, which brings blood from the patient into the dialyzer, is marked red. The venous return line, returning blood to the patient, is blue. This red color for the arterial line aids safety by making it easy to verify correct connections and flow direction during setup and troubleshooting. Note that while red is commonly used for the arterial line, always follow your facility’s labeling and the machine’s guidance.