1
LSR OctoberApril 2016
Contents
Recommended Representations
Contents
1. Introduction
2. Scope
3. Units of Measure in this Release.
Table 1 Units of Measure
Table 2 Components of a Unit
Prefixes
APPENDIX A
New recommedations for October 2016
1. Introduction
All data in the this document, is associated tab delimited file and the PBCL UnitsRecommendations file are informative and for recommended use and guidance only.
The linkage to units of measurement has focussed on items with a numerical report as units are more firmly established for these items. The ‘units of measurement’ for most of microbiology and much immunology are semi-quantitative with a range of reporting largely reflecting the methodological developments in this area and relative lack of internationally agreed methods or calibrators.
The gaps in the attribution of units, the ‘for review’ notes and scanty DCI codes all indicate that the updating of PBCL is an ongoing process and requires further specialist input and peer review. This is despite considerable review by specialists and items being available for comment via professional websites. For some analytes there is a lack of consensus concerning units and these items are marked with ‘check’.
Laboratories are encouraged to adopt these units of measurement as soon as possible. However when changing reporting units of measurement, users must be fully informed and any related changes to historical results within databases must also be anticipated and addressed. In addition, downstream changes to how reporting units are displayed within other databases populated from the LIMS (i.e. GP systems, specialty databases and order comm systems) also require the appropriate level of attention to ensure patient safety issues do not arise as an unintended consequence.
2. Scope
This document describes the content of the Units of Measurement Result Recommended Representations aligned with the October 2016 PBCL Release (Version 1.034)
3. Units of Measure in this Release.
The Units files are produced under the guidance and recommendations of Professionals from the Royal Collage of Pathologists. Users should confirm references to the Read V2 and V3 codes, terms and statuses within the Recommended Units files against the Core files before use. The files should only be used in association with PBCL 22.0.0_20161001000001 and with the main October 2016 Read release files.
The content within this release has undergone reviews by the Primary Care Pathology (information standards) National User Group. This release was approved by the Primary Care Pathology National Advisory Group for publication.
For technical deployment a tab delimited file containing only Current (C) unit entries is also published alongside this PDF reference document.
Recommendation: Full end-to-end testing is performed when units are amended.
1
LSR October 2016
Table 1 Units of Measure
Representation / Full meaning / Status / Release Date / Comment10*3/mL / 10*3/millilitre; thousands per millilitre / Current / 14/07/2000 / Standardise on /L
10*6/mL / 10*6/millilitre; millions per millilitre / Current / 14/07/2000 / Standardise on /L
10*9/mL / 10*9/millilitre; billions per / Current / 14/07/2000 / Standardise on /L
bp / base pair / Current / 01/04/2016 / 2016-03-14 New Addition - For use in genetics
BU / Bethesda Units / Current / 24/01/2014 / 2016-03-14 Reviewed No change
copiesx10*9/L / billion copies per litre / Current / 24/01/2014 / 2016-03-14 Reviewed No change
x10*9/L / billions per litre / Current / 01/11/2014 / For cell counts
cells/uL / cells per microlitre / Current / 11/11/2014 / For lymphocyte subsets
cells/uL / cells per microlitre / Current / 24/01/2014 / For CD counts
cm / centimetre / Current / 24/01/2014 / 2016-03-14 Reviewed No change
cm H2O / centimetres of water / Current / 14/07/2000 / 2016-03-14 Reviewed No change
cP / centipoise / Current / 14/07/2000 / 2016-03-14 Reviewed No change
CU / Chemiluminescence units / Current / 01/04/2016 / 2016-03-14 - New Addition - Immunology request.
cfu / colony forming unit / Current / 14/07/2000 / 2016-03-14 Reviewed No change
cfu/L / colony forming units per litre / Current / 24/01/2014 / To align with Microbiology Specialty Investigations
copies / copies / Current / 24/01/2014 / 2016-03-14 Reviewed No change
copies/mL / copies per millilitre / Current / 24/01/2014 / For use in viral loads
counts/min / counts (radioactivity) per minute / Current / 24/01/2014 / Request Forensic Pathology
d / day / Current / 01/11/2014 / For sole use for period of abstinence
degC / degrees Celsius / Current / 14/07/2000 / 2016-03-14 Reviewed No change
Det/Not Det / Detected/Not Detected / Current / For screening tests and detection tests
feet / feet (length) / Current / 24/01/2014 / Request Forensic SAC
fg / femtogram / Current / 14/07/2000 / 2016-03-14 Reviewed No change
fL / femtolitre / Current / 14/07/2000 / 2016-03-14 Reviewed No change
fmol / femtomole / Current / 14/07/2000 / 2016-03-14 Reviewed No change
GU/L / giga-units per litre / Current / 24/01/2014 / 2016-03-14 Reviewed No change
g / gram / Current / 14/07/2000 / 2016-03-14 Reviewed No change
g/24h / grams per 24 hours / Current / 25/07/2012 / 2014-01-24 NLMC preferred term rather than g/day.
g/L / grams per litre / Current / 25/07/2012 / 2014-01-24 Full meaning changed to grams per litre
g/mol / grams per mole / Current / 25/07/2012 / 2014-01-24 Full meaning changed to grams per mole
High/Mod/Low / High/Moderate/Low / Current / For viral avidity tests
h / hour / Current / 14/07/2000 / 2016-03-14 Reviewed No change
copiesx10*2/L / hundred copies per litre / Current / 24/01/2014 / 2016-03-14 Reviewed No change
APLU / IgA phospholipid unit / Current / 24/01/2014 / 2016-03-14 Reviewed No change
GPLU / IgG phospholipid unit / Current / 14/07/2000 / 2016-03-14 Reviewed No change
inch / inch (length) / Current / 24/01/2014 / Request Forensic Pathology
IU / international unit / Current / 24/01/2014 / NLMC preferred format
IU/IU / international unit per international unit / Current / 01/10/2014 / As used in AST/ALT ratio
IU/dL / international units per decilitre / Current / 24/01/2014 / For coagulation reports
2014-10-01 As used in Plasma factor XII level
2016-10-01 Standardise on IU/L
IU/g Hb / international units per gram of haemoglobin / Current / 01/10/2014 / As used in Pyruvate kinase
IU/L / international units per litre / Current / 25/07/2012 / 2016-03-14 Reviewed No change
IU/mL / international units per millilitre / Current / 24/01/2014 / Standardise on kIU/L
IU/10*12 RBC / international units per trillion red blood cells / Current / 01/10/2014 / As used in Glucose 6-phosphate dehydrogenase
IU/24h / international units per twenty four hours / Current / 24/01/2014 / NLMC preferred format
kat / katal / Current / 14/07/2000 / 2016-03-14 Reviewed No change
kat/kg / katals per kilogram / Current / 14/07/2000 / 2014-01-24 Full meaning changed to katals per kilogram
kat/L / katals per litre / Current / 14/07/2000 / 2014-01-24 Full meaning changed to katals per litre
Kb / kilobase / Current / 01/04/2016 / 2016-03-14 New Addition For use in genetics
kg / kilogram / Current / 14/07/2000 / 2016-03-14 Reviewed No change
kg/L / kilograms per litre / Current / 14/07/2000 / 2016-03-14 Reviewed No change
kPa / kilopascal / Current / 14/07/2000 / 2016-03-14 Reviewed No change
L / litre / Current / 14/07/2000 / 2016-03-14 Reviewed No change
L/L / litre per litre / Current / 25/07/2012 / 2016-03-14 Reviewed No change
log copies/mL / log copies/mL / Current / 2016-03-14 Reviewed No change
m / metre (length) / Current / 14/07/2000 / 2014-01-24 Full meaning changed to metre (length) from metre
m/s / metres per second / Current / 14/07/2000 / 2014-01-24 – Full meaning changed to metres per second
ueq / microequivalent / Deprecate / 14/07/2000 / 2016-03-14 Reviewed No change
2016-10-01 Deprecated
ug / microgram / Current / 14/07/2000 / 2016-03-14 Reviewed No change
ug/g / micrograms per gram / Current / 14/07/2000 / 2014-01-24 Full meaning changed to micrograms per gram
ug/L / micrograms per litre / Current / 14/07/2000 / 2014-01-24 Full meaning changed to micrograms per litre
ug/L/h / micrograms per litre per hour / Current / 24/01/2014 / 2016-03-14 Reviewed No change
ug/mmol / micrograms per millimole / Current / 01/10/2014 / 2016-10-01 Protocol of minimising prefixes means this should be "mg/mol"
Standardise on mg/mol
ug/min / micrograms per minute / Current / 14/07/2000 / 2014-01-24 Full meaning changed to micrograms per minute
ug/24h / micrograms per twenty four hours / Current / 24/01/2014 / NLMC preferred term rather than /day
uIU/L / micro-international units per litre / Current / 24/01/2014 / 2016-03-14 Reviewed No change
uL / microlitre / Current / 01/10/2009 / 2016-03-14 Reviewed No change
uL/30min / microlitre/30 minutes / Current / 01/10/2009 / 2016-03-14 Reviewed No change
um / micrometre (micron) / Current / 14/07/2000 / 2016-03-14 Reviewed No change
umol / micromole / Current / 14/07/2000 / 2016-03-14 Reviewed No change
umol/24h / micromole per 24 hours / Current / 25/07/2012 / 2014-01-24 NLMC preferred term rather than /day
umol/g / micromoles per gram / Current / 24/01/2014 / 2016-03-14 Reviewed No change
umol/g/h / micromoles per gram per hour / Current / 24/01/2014 / 2016-03-14 Reviewed No change
umol/h/g Hb / micromoles per hour per gram of haemoglobin / Current / 01/10/2014 / As used in Galactose-P UT
umol/h/g protein / micromoles per hour per gram of protein / Current / 01/10/2014 / As used in Bld (WBC) scr a- fucosidosis
umol/h/L / micromoles per hour per litre / Current / 01/10/2014 / As used in Plasma B-mannosidase level
umol/L / micromoles per litre / Current / 14/07/2000 / 2014-01-24 - Full meaning changed to micromoles per litre
umol/L/h / micromoles per litre per hour / Current / 24/01/2014 / 2016-03-14 Reviewed No change
umol/L/min / micromoles per litre per minute / Current / 24/01/2014 / 2016-03-14 Reviewed No change
umol/mmol / micromoles per millimole / Current / 01/11/2014 / 2016-03-14 Reviewed No change
2016-10-01 UCUM convention of minimising number of order of magnitude prefixes says this should be "mmol/mol"
Standardise on mmol/mol
umol/min / micromoles per minute / Current / 14/07/2000 / 2014-01-24 - Full meaning changed to micromoles per minute
umol/mol / micromoles per mole / Current / 14/07/2000 / 2014-01-24 - Full meaning changed to micromoles per mole
umol/mol Hb / micromoles per mole of haemoglobin / Current / 01/10/2014 / As used in RBC zinc protoporphyrin conc
umol/mL/h / micromoles/millilitre/hour / Current / 14/07/2000 / Should standardise on mmol/L/h
us / microsecond / Current / 14/07/2000 / 2016-03-14 Reviewed No change
uU/spec / microunits per specimen / Current / 24/01/2014 / 2016-03-14 Reviewed No change
meq / milliequivalent / Deprecate / 14/07/2000 / 2016-03-14 Reviewed No change
2016-10-01 Obsolete; Deprecate
meq/L / milliequivalents per litre / Deprecate / 14/07/2000 / 2014-01-24 Full meaning changed to milliequivalents
2016-10-01 Obsolete; Deprecate
mg / milligram / Current / 14/07/2000 / 2016-03-14 Reviewed No change
mg/24h / milligrams per 24 hours / Current / 25/07/2012 / 2014-01-24 Reviewed NLMC preferred rather than /day
mg/m*3 / milligrams per cubic metre / Current / 24/01/2014 / 2016-03-14 Reviewed No change
mg/dL / milligrams per decilitre / Current / 14/07/2000 / 2016-10-12 Stardardise on mg/L
mg/g / milligrams per gram / Current / 25/07/2012 / 2014-01-24 Full meaning changed to milligrams per gram.
mg/g wet wt / milligrams per gram wet weight / Current / 01/10/2014 / 2014-01-2014 Reviewed No change
mg/L / milligrams per litre / Current / 14/07/2000 / 2014-01-24 Full meaning changed to milligrams per litre
mg/mmol / milligrams per millimole / Current / 14/07/2000 / 2014-01-24 Full meaning changed to milligrams per millimole
mg/min / milligrams per minute / Current / 01/10/2014 / As used in Albumin excretion rate 2014-01-24 Full meaning change to milligrams per minute
mIU/L / milli-international units per litre / Current / 25/07/2012 / 2014-01-24 NLMC preferred format
mL / millilitre / Current / 14/07/2000 / 2016-03-14 Reviewed No change
mL/kg / millilitres per kilogram / Current / 01/10/2014 / As used in Red cell mass
mL/min / millilitres per minute / Current / 14/07/2000 / 2014-01-24 Full meaning changed to millilitres per minute
mL/min/1.73m*2 / millilitres per minute per 1.73 (body surface area) / Current / 14/04/2007 / 2014-01-24 Full meaning changed to millilitres per minute per 1.73 square metre
mL/s / millilitres per second / Current / 14/07/2000 / Avoid if possible
mm / millimetre (length) / Current / 14/07/2000 / 2014-01-24 Full meaning changed to millilitre (length)
mm Hg / millimetres of mercury / Current / 14/07/2000 / 2016-03-14 Reviewed No change
mm/h / millimetres per hour / Current / 14/07/2000 / For ESR sole use
mmol/mmol / millimole per millimole / Current / 01/11/2014 / 2016-03-14 Reviewed No change
mmol/24h / millimoles per 24 hours / Current / 25/07/2012 / 2014-01-24 NLMC preferred term rather than /day
mmol/h/g protein / millimoles per hour per gram of protein / Current / 01/10/2014 / As used in Blood acid esterase level
mmol/kg / millimoles per kilogram / Current / 25/07/2012 / 2014-01-24 Full meaning changed to millimoles per kilogram
mmol/L / millimoles per litre / Current / 14/07/2000 / 2014-01-24 Full meaning changed to millimoles per litre
mmol/L/h / millimoles per litre per hour / Current / 24/01/2014 / 2016-03-14 Reviewed No change
mmol/mol / millimoles per mole / Current / 14/07/2000 / 2014-01-24 Full meaning changed to millimoles per mole
copiesx10*6/L / million copies per litre / Current / 24/01/2014 / 2016-03-14 Reviewed No change
x10*6/L / millions per litre / Current / 01/10/2014 / As used in NK (bright) cell absolute count
mPa.s / millipascal seconds / Current / 01/11/2014 / 2016-03-14 Reviewed No change
mU/L / milliunits per litre / Current / 01/11/2014 / 2016-03-14 Reviewed No change
min / minute (time) / Current / 14/07/2000 / 2016-03-14 Reviewed No change
mol/kg / moles per kilogram / Current / 14/07/2000 / 2014-01-24 Full meaning changed to moles per kilogram
mol/L / moles per litre / Current / 14/07/2000 / 2014-01-24 Full meaning changed to moles per litre from moles/litre
mol/mol / moles per mole / Current / 25/07/2012 / 2014-01-24 Full meaning changed to moles per mole
mol/s / moles per second / Current / 14/07/2000 / 2014-01-24 Full meaning changed to moles per second
MoM / multiples of median / Current / 25/07/2012 / 2014-001-24 Full meaning changed to multiples of median
ng/mL / nanograms per millilitre / Current / 14/07/2000 / Standardise on ug /L
ng/mL/h / nanograms per millilitre per hour / Current / 01/01/2005 / Standardise on ug/L/h
nm / nanometre / Current / 14/07/2000 / 2014-01-24 Full meaning changed to nanometre from Nanometer
nmol/g dry wt / nanomole per gram dry weight / Current / 25/07/2012 / 2014-01-24 Full meaning changed to nanomole per gram (dry weight)
nmol/24h / nanomoles per 24 hours / Current / 25/07/2012 / 2014-01-24 NLMC preferred rather than /day
nmol/10*9 platelets / nanomoles per billion platelets / Current / 01/10/2014 / As used in Blood serotonin level
nmol/g dry wt / nanomoles per gram dry weight / Current / 01/10/2014 / As used in Faecal coproporphyrin level
nmol/g Hb /h / nanomoles per gram haemoglobin per hour / Current / 25/07/2012 / 2016-03-14 Reviewed No change
nmol/g Hb / nanomoles per gram of haemoglobin / Current / 01/10/2014 / As used in Red cell vitamin B2 level
nmol/g/h / nanomoles per gram per hour / Current / 24/01/2014 / 2016-03-14 Reviewed No change
nmol/h/g Hb / nanomoles per hour per gram of haemoglobin / Current / 01/10/2014 / As used in Red cell TPMT level
nmol/h/ml RBC / nanomoles per hour per millilitre of red blood cells / Current / 01/10/2014 / As used in Blood eryth PBG deaminase level
nmol/h/mL washed RBC / nanomoles per hour per millilitre of washed red blood cells / Current / 01/11/2014 / 2016-03-14 Reviewed No change
nmol/L / nanomoles per litre / Current / 14/07/2000 / 2014-01-24 Full meaning changed to nanomoles per litre
nmol/L/h / nanomoles per litre per hour / Current / 14/07/2000 / 2014-01-24 Full meaning changed to nanomoles per litre per hour
nmol/mL RBC/h / nanomoles per millilitre RBCs per hour / Current / 2016-03-14 Reviewed No change
nmol/min/mL / nanomoles per minute per millilitre / Current / 01/10/2014 / As used in Serum biotinidase level
nmol/mol / nanomoles per mole / Current / 25/07/2012 / 2014-01-24 Full meaning changed to nanomoles per mole
nmol/s / nanomoles per second / Current / 14/07/2000 / 2014-01-24 Full meaning changed to nanomoles per second
nmol/g / nanomoles/gram / Current / 20/09/2002 / 2016-03-14 Reviewed No change
nmol/h/mLRBC / nanomoles/hour/millilitre RBC / Current / 20/09/2002 / Standardise on nmol/mLRBC/h
ns / nanosecond / Current / 14/07/2000 / 2016-03-14 Reviewed No change
Normal/Abnormal / Normal/Abnormal / Current / For neutrophil function test
1 / O.D. (optical density, absorbance) / Current / 14/07/2000 / 2016-03-14 Reviewed No change
Ppm / parts per million / Current / 14/07/2000 / Needed for legal reasons not clinical
Ppb / parts per billion / Current / 14/07/2000 / Needed for legal reasons not clinical
Pa / Pascal / Current / 14/07/2000 / 2016-03-14 Reviewed No change
% / percent / Current / 14/07/2000 / 2016-03-14 Reviewed No change
%Hb / percent haemoglobin / Current / 01/10/2008 / Kept for haemoglobinopathy reports.
% dec abs / percentage decrease in absorbance / Current / 02/10/2014 / As used in ADP 1 umol test
% Haemolysis / percentage haemolysis / Current / 01/11/2014 / 2016-03-14 Reviewed No change
% Normal / percentage of normal / Current / 01/10/2014 / As used in Haem complem (CH50) level
/hpf / per high power field / Current / 14/07/2000 / 2016-03-14 Reviewed No change
/10*2 cells / per hundred cells / Current / 24/01/2014 / 2016-03-14 Reviewed No change
/kg body wt / per kilogram body weight / Current / 14/07/2000 / 2016-03-14 Reviewed No change
/24h / per twenty four hours / Current / 24/01/2014 / NLMC preferred format
1 / pH / Current / 14/07/2000 / 2016-03-14 Reviewed No change
pg / picogram / Current / 14/07/2000 / 2016-03-14 Reviewed No change
pg/L / picograms per litre / Current / 14/07/2000 / 2014-01-24 Full meaning changed to picograms per litre
pkat / picokatal / Current / 14/07/2000 / 2016-03-14 Reviewed No change
pm / picometre / Current / 14/07/2000 / 2016-03-14 Reviewed No change
pmol / picomole / Current / 14/07/2000 / 2016-03-14 Reviewed No change
pmol/pmol / picomole per picomole / Current / 01/10/2014 / As used in Pl aldosteron:renin active ratio
pmol/8x10*8 RBC / picomoles per eight hundred million red blood cells / Current / 01/10/2014 / As used in RBC 6-mercaptopurine level
pmol/g Hb / picomoles per gram of haemoglobin / Current / 01/11/2014 / 2016-03-14 Reviewed No change
pmol/g RBC / picomoles per gram of red blood cells / Current / 01/10/2014 / As used in Red cell vitamin B1 level
pmol/L / picomoles per litre / Current / 14/07/2000 / 2014-01-24 Full meaning changed to picomoles per litre
pmol/mL/h / picomoles per millilitre per hour / Current / 01/10/2014 / As used in Plasma renin activity ambulant
pmol/mU / picomoles per milliunit / Current / 01/10/2014 / As used in Pl aldosteron:renin conc ratio
ps / picosecond / Current / 14/07/2000 / 2016-03-14 Reviewed No change
pfu / plaque forming units / Current / 24/01/2014 / 2016-03-14 Reviewed No change
pfu/L / plaque forming units per litre / Current / 24/01/2014 / 2016-03-14 Reviewed No change
PNH Clone positive/PNH Clone Neg / PNH Clone positive/PNH Clone Neg / Current / For Paroxysmal Nocturnal Haemoglobinuria
Pos / positive / Current / 24/01/2014 / 2016-03-14 Reviewed No change
Pos/Neg/Equiv / Positive/Negative/Equivocal / Current / For qualitative tests
10*15 / quadrillion / Current / 24/01/2014 / 2016-03-14 Reviewed No change
10*18 / quintillion / Current / 24/01/2014 / 2016-03-14 Reviewed No change
Rad / rad (radiation) / Current / 14/07/2000 / 2016-03-14 Reviewed No change
Xx:xx / ratio / Current / 14/07/2000 / 2016-03-14 Reviewed No change
s / second (time) / Current / 14/07/2000 / 2016-03-14 Reviewed No change
10*21 / sextillion / Current / 24/01/2014 / 2016-03-14 Reviewed No change
m*2 / square metre / Current / 24/01/2014 / 2016-03-14 Reviewed No change
kAU/L / thousand arbitrary units per litre / Current / 25/07/2012 / For non- standardised methods
copiesx10*3/L / thousand copies per litre / Current / 24/01/2014 / 2016-03-14 Reviewed No change
kIU/L / thousands of international units per litre / Current / 25/07/2012 / 2014-01-24 Full meaning changed to thousands of international units per litre from kilo international units per litre
kUA/L / thousands of units of allergen
specific antibody per litre / Current / 24/01/2014 / Advice of Immunology SAC
kU/L / thousands of units per litre / Current / 25/07/2012 / 2014-01-24 Full meaning changed to thousands of units per litre from kilo unit per litre
Titre / titre / Current / 24/01/2014 / 2016-03-14 Reviewed No change
10*12 / trillion / Current / 24/01/2014 / 2016-03-14 Reviewed No change
copiesx10*12/L / trillion copies per litre / Current / 24/01/2014 / 2016-03-14 Reviewed No change
x10*12/L / trillions per litre / Current / 01/11/2014 / For cell counts
U/L / unit per litre / Current / 25/07/2012 / 2014-01-24 units per litre
U/24h / units per 24 hours / Current / 25/07/2012 / 2014-01-24 Reviewed Full meaning changed to units per 24 hours
U/dL / units per decilitre / Current / 14/07/2000 / 01/10/2014 As used in Plasma free protein S level
2016-10-01 Standardise as U/L
NOTE: abbreviation for units is upper case 'U'
U/g / units per gram / Current / 24/01/2014 / 2016-03-14 Reviewed No change
U/g Hb / units per gram Haemoglobin / Current / 14/07/2000 / For G6PD and PK assays only
U/mmol / Units per millimole / Current / 01/11/2014 / 2016-03-14 Reviewed No change
v / volume / Deprecate / 25/07/2012 / 2016-03-14 Reviewed No change
2016-10-01 Volume is an attribute not a UOM - deprecate
Normal/Abnormal / Current / 2016-03-14 Reviewed No change
Increased/Decreased / Current / 2016-03-14 Reviewed No change
Table 2 Components of a Unit
Representation / Full meaning / Status / Release Date / Comment/m*3 / per cubic metre / Current / 24/01/2014 / 2016-03-14 – Reviewed – No change
/hpf x400 / per high power field at x400 magnification / Current / 24/01/2014 / 2016-03-14 Reviewed - No change
/10*2 WBC / per hundred White Blood Cells / Current / 24/01/2014 / 2016-03-14 Reviewed No change
/L / per litre / Current / 14/07/2000 / 2014-01-24 Full meaning changed to per litre
/uL / per microlitre / Current / 14/07/2000 / Should standardise on /L
/mL / per millilitre / Current / 14/07/2000 / Should standardise on /L
/min / per minute / Current / 14/07/2000 / 2014-01-24 Full meaning changed to per min from beats per min
/24h / per twenty four hours / Current / 2016-03-14 – Reviewed – No change
/m*2 / per square metre / Current / 2016-03-14 – Reviewed – No change
10*12/L / 10*12/litre; trillions per litre / Current / 14/07/2000 / 2014-01-24 Full meaning changed to 10*12/litre; trillions per litre
10*-2 / 10*-2 ; one hundredth / Current / 14/07/2000 / 2014-01-24 Full meaning changed to 10*-2 ; one hundredth
10*-3 / 10*-3 ; one thousandth / Current / 14/07/2000 / 2014-01-24 Full meaning changed to 10*-3 ; one thousandth
10*3/L / 10*3/litre; thousands per litre / Current / 14/07/2000 / 2014-01-24 Full meaning changed to 10*3/litre; thousands per litre
10*6/L / 10*6/litre; millions per litre / Current / 14/07/2000 / 2014-01-24 Full meaning changed to 10*6/litre; millions per litre
10*9/L / 10*9/litre; billions per litre / Current / 14/07/2000 / 2014-01-24 Full meaning changed to 10*9/litre; billions per litre
(BSA) / body surface area / Current / 14/07/2000 / 2016-03-14 – Reviewed – No change
AU / Arbitrary Units / Current / 24/01/2014 / For non- standardised methods
10*9 / billion (1,000,000,000) / Current / 14/07/2000 / 2016-03-14 – Reviewed – No change
uIU / micro-international units / Current / 24/01/2014 / 2016-03-14 – Reviewed – No change
ukat / microkatal / Current / 14/07/2000 / 2016-03-14 – Reviewed – No change
mIU / milli-international unit / Current / 2016-03-14 – Reviewed – No change
mmol / millimole / Current / 14/07/2000 / 2016-03-14 – Reviewed – No change
10*6 / million / Current / 14/07/2000 / 2016-03-14 – Reviewed – No change
nkat / nanokatal / Current / 14/07/2000 / 2014-01-24 Full meaning changed to nanokatal from Nanokatal
10*3 / thousand / Current / 14/07/2000 / 2016-03-14 – Reviewed – No change
U / unit / Current / 24/01/2014 / NLMC preferred term rather than /day
Prefixes
Representation / Full meaning / Scientific Notation / Multiplying Factor / Status / Release Date / CommentM / Metre (prefix) / Current / 24/01/2014 / 2016-03-14 – Reviewed – No change
SI Prefixes
Y / yotta (Y) / 1 000 000 000 000 000 000 000 000
Z / zetta (Z) / 1 000 000 000 000 000 000 000
E / exa (E) / 1 000 000 000 000 000 000
P / peta (P) / 1 000 000 000 000 000
T / tera (T) / 1 000 000 000 000
G / giga (G) / 1 000 000 000 / Current / 24/01/2014 / 2016-03-14 – Reviewed – No change
M / mega (M) / 1 000 000 / Current / 24/01/2014 / 2016-03-14 – Reviewed – No change
k / kilo (k) / 1 000 / Current / 24/01/2014 / 2016-03-14 – Reviewed – No change
m / milli (m) / 0.001 / Current / 24/01/2014 / 2016-03-14 – Reviewed – No change
u / micro (µ) / 0.000 001 / Current / 24/01/2014 / 2016-03-14 – Reviewed – No change
n / nano (n) / 0.000 000 001 / Current / 24/01/2014 / 2016-03-14 – Reviewed – No change
p / pico (p) / 0.000 000 000 001 / Current / 24/01/2014 / 2016-03-14 – Reviewed – No change
f / femto (f) / 0.000 000 000 000 001 / Current / 24/01/2014 / 2016-03-14 – Reviewed – No change
a / atto (a) / 0.000 000 000 000 000 001
Z / zepto (z) / 0.000 000 000 000 000 000 001
Y / yocto (y) / 0.000 000 000 000 000 000 000 001
APPENDIX A
Changes to New rrecommedationss for October 2016
The table below includes new recommendationsprovides details and notification of changes that have been incorporated that have been included in the October 2016 release