critical value

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critical value

Critical results Lab medicine A lab result from a Pt that must be reported immediately to care provider, which may require urgent therapeutic action. See Decision levels.
Critical values in the laboratory
Chemistry
Analyte  SI units US units
Calcium < 1.65 mmol/L  < 6.6 mg/dl
   > 2.22 mmol/L   > 12.9 mg/dl
Glucose  < 2.60 mmol/L  < 46 mg/dl
       > 26.9 mmol/L   > 484 mg/dl
K+  < 2.8 mmol/L  < 2.8 mEq/L
    > 6.2 mmol/L  > 6.2 mEq/L
      > 8.0 mmol/L if hemolyzed
Na+   < 120 mmol/L  < 120 mEq/L
      > 158 mmol/L  > 158 mEq/L
CO2 –plasma  < 11 mmol/L  < 11 mMol
   > 40 mmol/L  > 40 mMol
Hematology, eg blasts or sickle cells on peripheral smear, may indicate leukemia or sickle cell anemia
Microbiology, eg positive gram stain or culture from blood, serosal fluids or CSF, acid-fast stain or positive mycobacterial culture results
Transfusion medicine Incompatible cross-match, positive VDRL

critical laboratory value

, critical value
A test result obtained from a clinical specimen that is so far outside the normal range that it is likely to indicate an acute risk to the health of the patient.
Synonym: critical result
References in periodicals archive ?
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.
In "Global trends in critical values practices and their harmonization," (6) Dr.
Laboratory critical values policies and procedures: a college of American pathologists Q-probe study in 623 institutions.
The relative proportion of critical values was highest in the emergency department in comparison with the relative distribution of annual POCG testing in other locations.
Analysis of laboratory repeat critical values at a large tertiary teaching hospital in China.
Johansen and Juselius [1990, 1992] have tabulated the asymptotic critical values for both the maximal eigenvalue and the trace tests.
Either way, two critical values are used, where the weight given to each depends on the regime probabilities.
Perron [16] and Christiano [2] suggest that critical values should incorporate two considerations.
Accordingly, although no solution to the correction [TABULAR DATA FOR TABLE 1 OMITTED] for guessing is in sight, it is possible to construct a table of critical values to evaluate the effect of guessing.
Because different turf species and cultivars may have different N requirements and use efficiencies, it is unclear how the critical values determined in this study would need to be adjusted for use in single species lawns or lawns with other species or cultivars.
Similarly, the nursing staff has been relieved of the task of notifying the responsible clinician of critical values except in those few instances when the operator could not locate the physician.