Critical values:  when they're reported, how they're used.
Division of Laboratory Systems, Public Health Practice Program Office, Centers for Disease Control and Prevention, U.S. Department of Health and Human Services.
S J
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Steindel
D002624:Chemistry, Clinical; D006403:Hematologic Tests; D006801:Humans; D007755:Laboratories, Hospital / Q000592:standards; D011785:Quality Assurance, Health Care; D012016:Reference Values