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Related Concept Videos

Conversion of Units01:36

Conversion of Units

38.1K
Sometimes, there is a need to convert from one unit to another one. For instance, reading a cookbook in which quantities are expressed in units of liters or ounces may require conversion of quantities to cups. Or, when looking up directions on how to get to a location, we may be interested to know how many miles we are going to walk. In this case, we would have to convert units of feet or meters to miles.
The first step in the unit conversion is to list the given units and the units required...
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Units of Measurement01:27

Units of Measurement

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Mechanical engineering is one of the oldest branches of engineering. It deals with designing, analyzing, and manufacturing machines and mechanical systems. To ensure precise and accurate calculations, units of measurement are used. They provide a standard system for expressing and comparing physical quantities.
There are various well-known historical measurement systems, such as the Babylonian system, the Roman system, the Egyptian system, the Olympian system, the British system, and the Indus...
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Units and Standards of Measurement01:10

Units and Standards of Measurement

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A physical quantity is defined either by specifying its measurement method or by stating how it is calculated from other measurements. For example, consider a metallic cube. We might define its mass and dimensions by specifying methods for measuring them, such as using a weighing machine and a meter scale. Then, we could define the volume by stating that it is the cube of its side, and we could calculate the density as the mass divided by the volume.
Measurements of physical quantities are...
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International System of Units01:29

International System of Units

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The International System of Units, known as the SI system, is a universally accepted measurement system recognized and used worldwide. The SI system is based on a set of three base units considered absolute, and their values do not change with location. These base units are meters, kilograms, and seconds.
Prefixes are used to define both larger and smaller quantities in the SI system. For example, milli, micro, and nano define smaller quantities, while kilo, mega, and giga are used to define...
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Measurement: Derived Units03:02

Measurement: Derived Units

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The International System of Units or SI system, by international agreement, has fixed measurement units for seven fundamental properties: length, mass, time, temperature, electric current, amount of substance, and luminosity. These are called the SI base units.
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Measurement: Standard Units03:38

Measurement: Standard Units

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Every measurement provides three kinds of information: the size or magnitude of the measurement (a number), a standard of comparison for the measurement (a unit), and an indication of the uncertainty of the measurement. While the number and unit are explicitly represented when a quantity is written, the uncertainty is an aspect of the errors in the measurement results.
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HPLC-based Assay to Monitor Extracellular Nucleotide/Nucleoside Metabolism in Human Chronic Lymphocytic Leukemia Cells
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Unit conversions between LOINC codes.

Ronald G Hauser1,2, Douglas B Quine1,3, Alex Ryder4,5

  • 1Veterans Affairs Connecticut Healthcare, West Haven, CT, USA.

Journal of the American Medical Informatics Association : JAMIA
|June 23, 2017
PubMed
Summary
This summary is machine-generated.

This study developed 285 unit conversions for Logical Observation Identifiers Names and Codes (LOINC) to improve laboratory data aggregation. These conversions enable interconversion of compatible laboratory test results, enhancing clinical data analysis.

Keywords:
LOINCclinical laboratory information systemscontrolled vocabulary

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Area of Science:

  • Medical Informatics
  • Clinical Laboratory Science
  • Biomedical Data Standards

Background:

  • Logical Observation Identifiers Names and Codes (LOINC) is a standard vocabulary for laboratory tests.
  • LOINC assigns unique codes for different units of measure for the same test, hindering data aggregation.
  • Lack of unit conversions between compatible LOINC codes impedes analysis of clinical laboratory results.

Purpose of the Study:

  • To develop bidirectional unit conversions for compatible LOINC codes.
  • To facilitate data aggregation and analysis of laboratory test results across different clinical laboratories.
  • To enhance the utility of diverse informatics projects through interconvertible laboratory data.

Main Methods:

  • A computational process was developed to identify potential unit conversions within the LOINC standard.
  • Expert reviewers oversaw and finalized the identified conversion list.
  • The developed unit conversions were applied to aggregated laboratory test results to demonstrate their utility.

Main Results:

  • A total of 285 bidirectional unit conversions were identified.
  • Conversions include routine clinical tests like sodium, magnesium, and human immunodeficiency virus (HIV).
  • Demonstrated the usefulness of these conversions in aggregating laboratory test results.

Conclusions:

  • The developed unit conversions address a critical gap in LOINC standardization.
  • Interconvertibility of compatible LOINC codes significantly benefits data aggregation and analysis.
  • These conversions will support various informatics projects requiring standardized laboratory data.