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Contents

Units of Measure 

Chapter:
Abbreviations
Author(s):

Roxanne K. Young

Units of Measure

JAMA and the Archives Journals report quantitative values in conventional units. See 18.5, Units of Measure, Conventional Units and SI Units in JAMA and the Archives Journals.

Use the following abbreviations and symbols with a numerical quantity in accordance with guidelines in 18.0, Units of Measure. See especially 18.5, Units of Measure, Conventional Units and SI Units in JAMA and the Archives Journals; Table 2 in chapter 18, Selected Laboratory Tests, References Ranges with and Conversion Factors; and 8.4, Punctuation, Forward Slash (Virgule, Solidus). Exception: The following example is an acceptable format in table footnotes or figure legends:

SI conversion factor: To convert creatinine value to mmol/L, multiply by 88.4.

Note: Do not capitalize abbreviated units of measure (unless the abbreviation itself is always capitalized or contains capital letters).

acre

acre

ampere

A

angstrom

Convert to nanometers (1 angstrom = 0.1 nm).

atmosphere, standard

atm

bar

bar

barn

b*

base pair

bp*

becquerel

Bq

billion electron volts

GeV*

Bodansky unit

BU*

British thermal unit

BTU

calorie

cal

candela

cd*

Celsius

C (Use closed up with degree symbol, eg, 40°C.)

centigram

cg

centimeter

cm

centimeters of water

cm H2O

centimorgan

cM

centipoise

cP

coulomb

C*

counts per minute

cpm

counts per second

cps

cubic centimeter

cm3 (Use milliliter for liquid and gas measure.)

cubic foot

cu ft

cubic inch

cu in

cubic meter

m3

cubic micrometer

μm3

cubic millimeter

mm3 (Use microliter for liquid and gas measure.)

cubic yard

cu yd

curie

Ci

cycles per second

Use hertz.

dalton

Da

day

d

decibel

dB

decigram

Convert to grams.

deciliter

dL

decimeter

Convert to meters.

diopter

D*

disintegrations per minute

dpm*

disintegrations per second

dps*

dyne

dyne

electron volt

eV

electrostatic unit

ESU*

equivalent

Eq

equivalent roentgen

equivalent roentgen

Fahrenheit

F (Use closed up with degree symbol, eg, 99°F.)

farad (electric capacitance)

F*

femtogram

fg

femtoliter

fL

femtomole

fmol

fluid ounce

fl oz

foot

ft (Convert to meters; query author.)

gas volume

gas volume

gauss

G

gigabyte

GB

grain

grain

gram

g

gravity (acceleration due to)

g (Use closed up to preceding number, eg, 200g.)

gray

Gy

henry

H*

hertz

Hz

horsepower

hp

hour

h

immunizing unit

ImmU*

inch

in

international benzoate unit

IBU*

international unit

IU

joule

J

katal

kat*

kelvin

K

kilobase

kb*

kilobyte

kB

kilocalorie

kcal

kilocurie

kCi

kilodalton

kDa

kiloelectron volt

keV

kilogram

kg

kilohertz

kHz

kilojoule

kJ

kilometer

km

kilopascal

kPa

kilovolt

kV

kilovolt-ampere

kVA

kilovolt (constant potential)

kV(cp)*

kilovolt (peak)

kV(p)*

kilowatt

kW

King-Armstrong unit

King-Armstrong unit

knot

knot

liter

L

lumen

lumen

lux

lux

megabyte

MB

megacurie

MCi

megacycle

Mc

megahertz

MHz

megaunit

MU

megawatt

MW

meter

m

metric ton

metric ton

microampere

μA

microcurie

μCi

microfarad

μF*

microgram

μg

microliter

μL

micrometer

μm

micromicrocurie

Use picocurie.

micromicrogram

Use picogram.

micromicrometer

Use picometer.

micromolar

μM

micromole

μmol

micron

Use micrometer.

micronormal

μN

microosmole

μOsm

microunit

μU

microvolt

μV

microwatt

μW

mile

mile

miles per hour

mph

milliampere

mA

millicurie

mCi

millicuries destroyed

mCid*

milliequivalent

mEq

millifarad

mF*

milligram

mg

milligram-element

mg-el*

milli-international unit

mIU

milliliter

mL

millimeter

mm

millimeters of mercury

mm Hg

millimeters of water

mm H2O

millimolar

mM

millimole

mmol

million electron volts

MeV

milliosmole

mOsm

millirem

mrem

milliroentgen

mR

millisecond

ms

milliunit

mU

millivolt

mV

milliwatt

mW

minute (time)

min

molar

M

mole

mol

month

mo

morgan

M*

mouse unit

MU*

nanocurie

nCi

nanogram

ng

nanometer

nm

nanomolar

nM

nanomole

nmol

newton

N

normal (solution)

N

ohm

osmole

osm

ounce

oz

outflow (weight)

C*

parts per million

ppm

pascal

Pa

picocurie

pCi

picogram

pg

picometer

pm

picomolar

pM

picomole

pmol

pint

pt

pound

lb (Convert to milligrams, kilograms, or grams; query author.)

pounds per square inch

psi

prism diopter

PD, Δ*

quart

qt

rad

rad

radian

radian

rat unit

RU*

revolutions per minute

rpm

roentgen

R

roentgen equivalents human (or mammal)

rem

roentgen equivalents physical

rep

Saybolt seconds universal

SSU*

second

s

siemen

siemen

sievert

Sv

sp g

specific gravity (Use with a number, eg, sp g 13.6.)

square centimeter

cm2

square foot

sq ft

square inch

sq in

square meter

m2

square millimeter

mm2

Svedberg flotation unit

Sf*

tesla

T

torr

Use millimeters of mercury.

tuberculin unit

TU

turbidity-reducing unit

TRU*

unit

U

volt

V

volume

vol

volume per volume

vol/vol

volume percent

vol%

watt

W

week

wk

weight

wt

weight per volume

wt/vol

weight per weight

wt/wt

yard

yd

year

y

* Expand at first mention, with the abbreviation immediately following in parentheses. Abbreviate thereafter, except at the beginning of a sentence. (See also 18.3.4, Units of Measure, Format, Style, and Punctuation, Beginning of Sentence, Title, Subtitle.)

Use the abbreviation only in a virgule construction and in tables and line art.

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