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Related Concept Videos

Critical Values01:31

Critical Values

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A critical value is a definite value obtained from a particular probability distribution at a predecided confidence level (or a predecided significance level) for a given population parameter. The critical value provides demarcation that separates the sample statistics that are likely to occur from the ones that are unlikely to occur based on the given probability distribution and the population parameter to be estimated. The critical value for normal distribution is obtained from the z...
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Critical Region, Critical Values and Significance Level01:16

Critical Region, Critical Values and Significance Level

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The critical region, critical value, and significance level are interdependent concepts crucial in hypothesis testing.
In hypothesis testing, a sample statistic is converted to a test statistic using z, t, or chi-square distribution. A critical region is an area under the curve in  probability distributions demarcated by the critical value. When the test statistic falls in this region, it suggests that the null hypothesis must be rejected. As this region contains all those values of the...
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Finding Critical Values for Chi-Square01:18

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Consider a curve representing sample data drawn randomly from a normally distributed population. One must construct confidence intervals to estimate or to test a claim regarding the population standard deviation. For example, a 95% confidence interval covers 95% of the area under the curve, and the remaining 5% is equally distributed on either side of the curve. To achieve such confidence intervals, one must determine the critical values. The critical values are simply the values separating the...
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Regulation of Hematopoietic Stem Cells01:01

Regulation of Hematopoietic Stem Cells

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All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
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Role of Hematopoietic Growth Factors01:28

Role of Hematopoietic Growth Factors

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Hematopoietic growth factors are molecules that regulate the differentiation rate of hematopoietic stem cells (HSCs). Erythropoietin (EPO), primarily produced by the kidneys, plays a crucial role in erythrocyte production. When oxygen levels in the blood are low, EPO is released into the bloodstream, reaching the bone marrow, where it stimulates HSCs to differentiate and mature into erythrocytes, which are vital for oxygen transport.
Thrombopoietin (TPO), mainly released by the liver,...
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Hematopoiesis01:21

Hematopoiesis

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The process of blood cell formation is called hematopoiesis. Hematopoiesis starts early during development, on the seventh day of embryogenesis. This phase of hematopoiesis is called the primitive wave, wherein the extraembryonic yolk sac allows the production of erythroid cells and endothelial cells from a common precursor called hemangioblast. The erythroid cells provide oxygen to support the growth of the rapidly dividing embryo. Hemangioblasts later develop into hematopoietic stem cells or...
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Critical values in hematology.

A McFarlane1, B Aslan, A Raby

  • 1Quality Management Program, Laboratory Services (QMP-LS), Toronto, ON, Canada; Institute for Quality Management in Healthcare (IQMH), Toronto, ON, Canada.

International Journal of Laboratory Hematology
|April 3, 2014
PubMed
Summary
This summary is machine-generated.

Hematology laboratories lack consensus on critical values, which are life-threatening results requiring immediate notification. Standardization of critical value reporting is essential for patient safety and consistent laboratory practice.

Keywords:
Laboratory practicegeneral hematology

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Area of Science:

  • Clinical Pathology
  • Laboratory Medicine
  • Hematology

Background:

  • Critical values are life-threatening laboratory results necessitating prompt healthcare provider notification.
  • Accreditation bodies mandate that laboratories establish critical value policies.
  • A survey assessed current practices for critical values in Ontario hematology laboratories.

Purpose of the Study:

  • To determine current practices for establishing and reporting critical values in hematology laboratories.
  • To identify variability in critical value policies and reporting procedures.

Main Methods:

  • A survey was distributed to 182 hematology laboratory professionals in Ontario.
  • The survey queried sources for critical value establishment, policy review frequency, delta checks, and reporting protocols.
  • Participants included laboratory managers, supervisors, and technologists.

Main Results:

  • Most laboratories have established critical limits for hemoglobin, leukocyte, and platelet counts, as well as for malaria parasites and blast cells.
  • Practices varied regarding policy sources, review frequency, and application to repeat samples.
  • Delta checks were rarely used to identify critical values, and most labs required confirmation of critical results with patient care providers.

Conclusions:

  • There is a significant lack of consensus in critical value reporting practices within hematology laboratories.
  • Standardization of critical value reporting is recommended to enhance patient safety and ensure consistent laboratory performance.