Here is a question originally posted November 4, 2011 that did not attract discussion at the time:
I received a note from David Chance, Good Samaritan Medical Center, Corvallis OR, commenting that, unlike underfilled coagulation specimen (blue-closure) tubes; overfilling tubes, unless clots are present, does not affect coagulation results. Overfilling may occur when a specimen is collected by syringe and pushed into a tube. There is no comment on overfilling in CLSI H21-A5, however I suspect that many laboratories reject obviously overfilled tubes. Please comment on this, what is your policy on overfilled tubes?