How do you establish a coag factor reference interval?

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Use a published RI from an article or textbook
10% (4 votes)
Use the reagent manufacturer's RI
2% (1 vote)
Validate manufacturer's RI using ~ 20 locally collected aliquots
38% (16 votes)
Validate manufacturer's RI using ~30 locally collected aliquots
26% (11 votes)
Validate manufacturer's RI using commercial normal sample set
10% (4 votes)
Generate a new RI using 120 locally collected plasmas
14% (6 votes)
Total votes: 42