can you draw blood from a tunnel catheter
Depending on its size, you might not be able to obtain a blood sample from a peripherally inserted central catheter (PICC). For example, drawing blood from small-gauge PICC lines (2 or 3 French) can be difficult. Although sources vary, the Infusion Nurses Society recommends using the distal port of a multi-lumen catheter for blood sampling. The distal port is largest (16-gauge) and has a greater flow rate.