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  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  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.
for 1 = 0 in the Error-correction Model.
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.