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Overfilled Tubes

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?

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