Glucose Ranges And Conversions
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part1 - part2 <../part2/preamble.html> - part3 <../part3/preamble.html> - part4 <../part4/preamble.html> - part5 <../part5/preamble.html> single page top document: diabetes faq: general (part 1 of 5) <preamble.html> previous document: what is glucose? what does "bg" mean? <section-8.html> next document: what is c-peptide? what do c-peptide levels mean? <section-10.html> -----------------------------------------------------------------------[ usenet faqs | search | web faqs | documents | rfc index ] what are mg/dl and mmol/l? how to convert? glucose? cholesterol? -----------------------------------------------------------------------there are two main methods of describing concentrations: by weight, and by molecular count. weights are in grams, molecular counts in moles. (if you really want to know, a mole is 6.23*10^23 molecules.) in both cases, the unit is usually modified by milli- or micro- or other prefix, and is always "per" some volume, often a liter. this means that the conversion factor depends on the molecular weight of the substance in question. mmol/l is millimoles/liter, and is the world standard unit for measuring glucose in blood. specifically, it is the designated si (systeme international) unit. "world standard", of course, means that mmol/l is used everywhere in the world except in the us. a mole is about 6*10^23 molecules; if you want more detail, take a chemistry course. mg/dl (milligrams/deciliter) is the traditional unit for measuring bg (blood glucose). all scientific journals are moving quickly toward using mmol/l exclusively. mg/dl won't disappear soon, and some journals now use mmol/l as the primary unit but quote mg/dl in parentheses, reflecting the large base of health care providers and researchers (not to mention patients) who are already familiar with mg/dl. since m.h.d is an international newsgroup, it's polite to quote both figures when you can. most discussions take place using mg/dl, and no one really expects you to pull out your calculator to compose your article. however, if you don't quote both units, it's inevitable that many readers will have to pull out their calculators to read it. many meters now have a switch that allows you to change between units. sometimes it's a physical switch, and sometimes it's an option that you can set. to convert mmol/l of glucose to mg/dl, multiply by 18. to convert mg/dl of glucose to mmol/l, divide by 18 or multiply by 0.055. these factors are specific for glucose, because they depend on the mass of one molecule (the molecular weight). the conversion factors are different for other substances (see below).
and remember that reflectance meters have a some error margin due to both intrinsic limitations and environmental factors, and that plasma readings are 15% higher than whole blood (as of 2002 most meters are calibrated to give plasma readings, thus matching lab readings, but this is a recent development), and that capillary blood is different from venous blood when it's changing, as after a meal. so round off to make values easier to comprehend and don't sweat the hundredths place. for example, 4.3 mmol/l converts to 77.4 mg/dl but should probably be quoted as 75 or 80. similarly, 150 mg/dl converts to 8.3333... mmol/l but 8.3 is a reasonable quote, and even just 8 would usually convey the meaning. actually, a table might be more useful than the raw conversion factor, since we usually talk in approximations anyway. mmol/l -----2.0 3.0 4.0 5.5 5 - 6 8.0 10.0 11.0 15.0 16.5 20.0 22 33
mg/dl ----35 55 75 100 90-110 150 180 200 270 300 360 400 600
interpretation -------------extremely low, danger of unconciousness low, marginal insulin reaction slightly low, first symptoms of lethargy etc. mecca normal preprandial in nondiabetics normal postprandial in nondiabetics maximum postprandial in nondiabetics a little high to very high depending on patient getting up there max mg/dl for some meters and strips high danger of severe electrolyte imbalance
preprandial = before meal postprandial = after meal more conversions: to convert mmol/l of hdl or ldl cholesterol to mg/dl, multiply by 39. to convert mg/dl of hdl or ldl cholesterol to mmol/l, divide by 39. to convert mmol/l of triglycerides to mg/dl, multiply by 89. to convert mg/dl of triglycerides to mmol/l, divide by 89. to convert umol (micromoles) /l of creatinine to mg/dl, divide by 88. to convert mg/dl of creatinine to umol/l, multiply by 88. -----------------------------------------------------------------------top document: diabetes faq: general (part 1 of 5) previous document: what is glucose? what does "bg" mean? next document: what is c-peptide? what do c-peptide levels mean? part1 - part2 <../part2/preamble.html> - part3 <../part3/preamble.html> - part4 <../part4/preamble.html> - part5 <../part5/preamble.html> single page -----------------------------------------------------------------------[ usenet faqs | search | web faqs | documents | rfc index ] ------------------------------------------------------------------------
send corrections/additions to the faq maintainer: [email protected] <mailto:[email protected]> *last update june 15 2004 @ 00:24 am*
and remember that reflectance meters have a some error margin due to both intrinsic limitations and environmental factors, and that plasma readings are 15% higher than whole blood (as of 2002 most meters are calibrated to give plasma readings, thus matching lab readings, but this is a recent development), and that capillary blood is different from venous blood when it's changing, as after a meal. so round off to make values easier to comprehend and don't sweat the hundredths place. for example, 4.3 mmol/l converts to 77.4 mg/dl but should probably be quoted as 75 or 80. similarly, 150 mg/dl converts to 8.3333... mmol/l but 8.3 is a reasonable quote, and even just 8 would usually convey the meaning. actually, a table might be more useful than the raw conversion factor, since we usually talk in approximations anyway. mmol/l -----2.0 3.0 4.0 5.5 5 - 6 8.0 10.0 11.0 15.0 16.5 20.0 22 33
mg/dl ----35 55 75 100 90-110 150 180 200 270 300 360 400 600
interpretation -------------extremely low, danger of unconciousness low, marginal insulin reaction slightly low, first symptoms of lethargy etc. mecca normal preprandial in nondiabetics normal postprandial in nondiabetics maximum postprandial in nondiabetics a little high to very high depending on patient getting up there max mg/dl for some meters and strips high danger of severe electrolyte imbalance
preprandial = before meal postprandial = after meal more conversions: to convert mmol/l of hdl or ldl cholesterol to mg/dl, multiply by 39. to convert mg/dl of hdl or ldl cholesterol to mmol/l, divide by 39. to convert mmol/l of triglycerides to mg/dl, multiply by 89. to convert mg/dl of triglycerides to mmol/l, divide by 89. to convert umol (micromoles) /l of creatinine to mg/dl, divide by 88. to convert mg/dl of creatinine to umol/l, multiply by 88. -----------------------------------------------------------------------top document: diabetes faq: general (part 1 of 5) previous document: what is glucose? what does "bg" mean? next document: what is c-peptide? what do c-peptide levels mean? part1 - part2 <../part2/preamble.html> - part3 <../part3/preamble.html> - part4 <../part4/preamble.html> - part5 <../part5/preamble.html> single page
send corrections/additions to the faq maintainer: [email protected] <mailto:[email protected]> *last update june 15 2004 @ 00:24 am*
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