# critical value

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## critical value

[′krid·ə·kəl ′val·yü]
(mathematics)
The value of the dependent variable at a critical point of a function.
(statistics)
A number which causes rejection of the null hypothesis if a given test statistic is this number or more, and acceptance of the null hypothesis if the test statistic is smaller than this number.
References in periodicals archive ?
4,5) Ultimately, accrediting agencies incorporated the critical values list into their requirements, so that at least in the United States, almost every laboratory uses critical values policies and procedures daily for results indicating potentially life-threatening situations.
Currently, our lab calls all critical values, multiple times, for the same patients, the same result.
Imprecision Screen and Critical Values for ADL With PctBnd = 5% and Degree of Polynomial = 1 or 2(*)
We also receive questions from readers about the topics covered by the four tables that comprise the first section of CLR--critical limits, cutoff and toxicity levels for drugs-of-abuse testing, reference intervals and critical values for therapeutic drug levels--and we are pleased to be able to refer them to CLR for answers.
Lundberg [1] was the first author to define critical values as results that may lead to adverse outcomes for patients if clinicians were not notified urgently of the critical result.
As a result, we wondered what level of agreement there was between pathologists and nonpathologists regarding critical values in anatomic pathology.
Appendices offer handy tables to such statistical matters as probabilities, critical values and distribution curves.
We constructed small-sample critical values from 1000 repetitions of the following experiment.
By Monte Carlo simulation, Levin and Lin [9] tabulated critical values for the purpose of testing unit root in finite samples of various N and T.
6,7) Based on an evaluation of repeat analyses for 580 critical laboratory values in chemistry, hematology, and coagulation testing, Chima et al recently reported that repeating critical values did not yield better accuracy and consequently considered it unnecessary for that purpose.
We also receive questions from readers about the topics covered by the four tables that comprise the first section of CLR--Critical Limits; Cutoff and Toxicity Levels for Drugs-of-Abuse Testing: Reference Intervals; and Critical Values for Therapeutic Drug Levels--and we are pleased to be able to refer them to CLR for answers.

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