I am not sure what the "mixing method" is. I stop (and clamp) any infusions and pulsatile flush with 10cc of normal saline. After waiting at least one full minute, I then draw back on syringe my discard --followed by drawing specimens with a vacutainer adapter.
Lynn Hadaway, M.Ed., RN, BC, CRNI
Lynn Hadaway Associates, Inc.
126 Main Street, PO Box 10
Milner, GA 30257
Office Phone 770-358-7861