We had a patient with PICC that flushes but is without blood return. Patient was dopplered and found to have a non-occlusive DVT in same vein as PICC. Is there a contraindication to using cath-flo on this patient? Pts PICC in place per CXR, patients arm asymptomatic. If cath-flo IS contraindicated, should PICC come out, or be used without blood return??