The customer reported that there was a clotting in the set and that this clotting extended all the way to the pt's catheter.
The machine did not alarm that there was a clotting.
Facility's acute mgr described the clotting as "very unusual" in that the red blood cells and plasma appeared to have separated.
She then set-up a new set and resumed treatment on this pt without difficulty.
She did not think that this was a machine problem as the pt continues to receive treatment on the same prisma machine without further incident.