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Conventional Units and SI Units in JAMA Network Journals.  

Lauren Fischer and Paul Frank

in AMA Manual of Style: A Guide for Authors and Editors (11th edn)

Print Publication Year: 
Feb 2020
Published Online: 
Feb 2020
DOI: 
10.1093/jama/9780190246556.003.0017.021.0006
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 report many laboratory values by means of conventional units. To serve these readers, but also to serve the needs of readers more familiar with JAMA Network journals have adopted an approach for reporting units of measure that includes a combination of SI units and conventional units....

Currency.  

Lauren Fischer and Paul Frank

in AMA Manual of Style: A Guide for Authors and Editors (11th edn)

Print Publication Year: 
Feb 2020
Published Online: 
Feb 2020
DOI: 
10.1093/jama/9780190246556.003.0017.022.0034
Item type: 
section
Amounts of money are expressed as a decimal number or whole number preceded by the symbol for the unit of measure for the currency. The cost-effectiveness analysis suggested a $7000 difference between the 2 treatment strategies. Table 17.5-5 lists some international currencies and their symbols. Online currency converter programs are also available....

Drug Doses.  

Lauren Fischer and Paul Frank

in AMA Manual of Style: A Guide for Authors and Editors (11th edn)

Print Publication Year: 
Feb 2020
Published Online: 
Feb 2020
DOI: 
10.1093/jama/9780190246556.003.0017.022.0031
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 as mixtures and have no specific molecular weight, thereby precluding their expression in mass units. Although other drug dose units, such as drops (for ophthalmologic preparations), grains (for aspirin), and various apothecary system measurements (eg, teaspoonfuls, ounces, and drams), may be encountered clinically, these units generally are not used....

Energy.  

Lauren Fischer and Paul Frank

in AMA Manual of Style: A Guide for Authors and Editors (11th edn)

Print Publication Year: 
Feb 2020
Published Online: 
Feb 2020
DOI: 
10.1093/jama/9780190246556.003.0017.022.0030
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 water by 1 °C. The joule is the preferred SI unit for energy, and calories and kilocalories may be converted to joules (J) and kilojoules (kJ) by using the following formulas:...

Laboratory Values.  

Lauren Fischer and Paul Frank

in AMA Manual of Style: A Guide for Authors and Editors (11th edn)

Print Publication Year: 
Feb 2020
Published Online: 
Feb 2020
DOI: 
10.1093/jama/9780190246556.003.0017.022.0032
Item type: 
section
In JAMA Network journals, laboratory values for clinical chemistry analyses, hematologic tests, immunologic assays, metabolic and endocrine tests, therapeutic drug monitoring, toxicology determinations, and urinalysis are reported by means of conventional laboratory units. Table 17.5-2 provides examples of conventional units and SI units and is intended to facilitate conversion from conventional units to SI units (and vice versa). A conversion calculator is freely available online at ...

Length, Area, Volume, Mass.  

Lauren Fischer and Paul Frank

in AMA Manual of Style: A Guide for Authors and Editors (11th edn)

Print Publication Year: 
Feb 2020
Published Online: 
Feb 2020
DOI: 
10.1093/jama/9780190246556.003.0017.022.0023
Item type: 
section
Measurements of length, area, volume, and mass are reported by means of metric units rather than English units (Table 17.5-1). In less formal, nonscientific texts, such as essays, use of nonmetric units, such as miles or inches, and the use of idioms, such as “An ounce of prevention is worth a pound of cure” or “give an inch,” are acceptable. In addition, if the nonmetric ...

pH.  

Lauren Fischer and Paul Frank

in AMA Manual of Style: A Guide for Authors and Editors (11th edn)

Print Publication Year: 
Feb 2020
Published Online: 
Feb 2020
DOI: 
10.1093/jama/9780190246556.003.0017.022.0028
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. Previous | Next 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; and for solutions with micromolar concentrations, ...

Pressure.  

Lauren Fischer and Paul Frank

in AMA Manual of Style: A Guide for Authors and Editors (11th edn)

Print Publication Year: 
Feb 2020
Published Online: 
Feb 2020
DOI: 
10.1093/jama/9780190246556.003.0017.022.0027
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]) is the recommended SI unit for pressure but generally is not used for reporting these common physiologic pressure measurements. Partial pressure of gases (eg, of oxygen and carbon dioxide) may be reported as millimeters of mercury (mm Hg) or as kilopascals (kPa) (...

Radiation.  

Lauren Fischer and Paul Frank

in AMA Manual of Style: A Guide for Authors and Editors (11th edn)

Print Publication Year: 
Feb 2020
Published Online: 
Feb 2020
DOI: 
10.1093/jama/9780190246556.003.0017.022.0033
Item type: 
section
Measurements of ionizing radiation and radioactivity should be reported by means of SI units. The SI units for radiation are established by international agreement.2 The unit for activity of a radionuclide is the becquerel; the absorbed dose of radiation (absorbed per unit weight of tissue) is the gray (Gy); and the dose equivalent used to indicate the detrimental effects of an absorbed radiation dose on biological tissue is the sievert (Sv)....

Solutions and Concentration.  

Lauren Fischer and Paul Frank

in AMA Manual of Style: A Guide for Authors and Editors (11th edn)

Print Publication Year: 
Feb 2020
Published Online: 
Feb 2020
DOI: 
10.1093/jama/9780190246556.003.0017.022.0029
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; and for solutions with micromolar concentrations, μmol/L is used. The concentration is given as 4-mmol/L potassium chloride not 4 mmol/L ...

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