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  • 18 Units of Measure x
  • 18.5 Conventional Units and SI Units in JAMA and the Archives Journals. x
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Conventional Units and SI Units in JAMA and the Archives Journals  

Phil B. Fontanarosa and Stacy Christiansen

in AMA Manual of Style: A Guide for Authors and Editors (10th edition)

Print Publication Year: 
2007
Published Online: 
2009
DOI: 
10.1093/jama/9780195176339.021.260
Item type: 
section
In the United States, most physicians and other health care professionals use conventional units for most commonly encountered clinical measurements (eg, blood pressure), and most clinical laboratories ... More

Length, Area, Volume, Mass  

Phil B. Fontanarosa and Stacy Christiansen

in AMA Manual of Style: A Guide for Authors and Editors (10th edition)

Print Publication Year: 
2007
Published Online: 
2009
DOI: 
10.1093/jama/9780195176339.022.561
Item type: 
section
Measurements of length, area, volume, and mass are reported by means of metric units rather than English units (Table ). In less formal, nonscientific texts such as essays, use of nonmetric units, such ... More

Temperature  

Phil B. Fontanarosa and Stacy Christiansen

in AMA Manual of Style: A Guide for Authors and Editors (10th edition)

Print Publication Year: 
2007
Published Online: 
2009
DOI: 
10.1093/jama/9780195176339.022.562
Item type: 
section
The Celsius scale (°C) is used for temperature measurement rather than the base SI unit for temperature, the kelvin (K), which has little application in medicine. Although both kelvin and Celsius scales ... More

pH  

Phil B. Fontanarosa and Stacy Christiansen

in AMA Manual of Style: A Guide for Authors and Editors (10th edition)

Print Publication Year: 
2007
Published Online: 
2009
DOI: 
10.1093/jama/9780195176339.022.566
Item type: 
section
Although SI nomenclature could be used to express values of hydrogen ion concentration (nmol/L), the pH scale (1 14) is used. ...

Time  

Phil B. Fontanarosa and Stacy Christiansen

in AMA Manual of Style: A Guide for Authors and Editors (10th edition)

Print Publication Year: 
2007
Published Online: 
2009
DOI: 
10.1093/jama/9780195176339.022.563
Item type: 
section
The SI unit for time is the second, although minute, hour, and day also are used. Other units of time, such as week, month, and year, are not part of the SI but also are used. The abbreviations for minute, ... More

Visual Acuity  

Phil B. Fontanarosa and Stacy Christiansen

in AMA Manual of Style: A Guide for Authors and Editors (10th edition)

Print Publication Year: 
2007
Published Online: 
2009
DOI: 
10.1093/jama/9780195176339.022.564
Item type: 
section
Visual acuity should be reported on the basis of how the measurement was determined. For example, using the Snellen fraction with English units, 20/20 or 20/100 indicates that the person being evaluated ... More

Pressure  

Phil B. Fontanarosa and Stacy Christiansen

in AMA Manual of Style: A Guide for Authors and Editors (10th edition)

Print Publication Year: 
2007
Published Online: 
2009
DOI: 
10.1093/jama/9780195176339.022.565
Item type: 
section
Blood pressure and intraocular pressure are reported in millimeters of mercury (mm Hg); cerebrospinal fluid pressure is reported as centimeters of water (cm H2O). The pascal (newton per square meter [N/m2]) ... More

Solutions and Concentration  

Phil B. Fontanarosa and Stacy Christiansen

in AMA Manual of Style: A Guide for Authors and Editors (10th edition)

Print Publication Year: 
2007
Published Online: 
2009
DOI: 
10.1093/jama/9780195176339.022.567
Item type: 
section
A molar solution contains 1 mol (1 g molecular weight) of solute in 1 L of solution. The SI style for reporting molar solutions is mol/L; for solutions with millimolar concentrations, mmol/L is used; ... More

Energy  

Phil B. Fontanarosa and Stacy Christiansen

in AMA Manual of Style: A Guide for Authors and Editors (10th edition)

Print Publication Year: 
2007
Published Online: 
2009
DOI: 
10.1093/jama/9780195176339.022.568
Item type: 
section
The calorie is the unit of measure often used in chemistry and biochemistry for reporting heat energy. A value of 1 calorie is the amount of energy (heat) required to raise the temperature of 1 g of pure ... More

Drug Doses  

Phil B. Fontanarosa and Stacy Christiansen

in AMA Manual of Style: A Guide for Authors and Editors (10th edition)

Print Publication Year: 
2007
Published Online: 
2009
DOI: 
10.1093/jama/9780195176339.022.569
Item type: 
section
Drug doses are expressed in conventional metric mass units (eg, milligrams or milligrams per kilogram), rather than in molar SI units. Moreover, certain drugs (such as insulin or heparin) may be prepared ... More

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