How do you establish a coag factor reference interval?

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Use a published RI from an article or textbook
7% (2 votes)
Use the reagent manufacturer's RI
0% (0 votes)
Validate manufacturer's RI using ~ 20 locally collected aliquots
41% (11 votes)
Validate manufacturer's RI using ~30 locally collected aliquots
30% (8 votes)
Validate manufacturer's RI using commercial normal sample set
4% (1 vote)
Generate a new RI using 120 locally collected plasmas
19% (5 votes)
Total votes: 27