Sorry & i don't wish to sound rude, but HbA1c, mg/dl, HbA1c(IFCC), mmol/L are quite likely acronyms with some sort of relative medical or scientific meaning that goes straight over my head, & i am sure many others.
You shouldn't have to have bamboozled with this type of thing. KISS, "Keep it simple silly" This is meant in general. .
All we really need to worry about are the actual numbers. My personal targets are to keep my HbA1c under 48, my home tests 4-7mmol.
But if you want to know what they all mean...
mmol/l (milli-moles per litre) is how our British meters measure blood sugar, again this is a sciencey term. A “mole” (mol for short) is a number based on the weight of a molecule of a substance, and is the universally recognised term (under the International System of Units) for an amount.* Mmol is short for milli-mole, which is a thousandth of a mole.
mg/dl is the American term, and is milligrams per decilitre - a milligram is a thousandth of a gram, and a decilitre is a tenth of a litre, ie 100cc - it’s a bit of an old fashioned term really, but I suppose it’s more up to date than grains per cubic inch
HbA1c** is a blood test that shows them the amount of glucose that has permanently welded itself to your red blood cells - as a cell lasts around three months, it’s regarded as an indicator of your levels over the last quarter. AKA the “lie detector”

It used to be given as a percentage (and still is in America), but we have since switched to the newer IFCC system mentioned, which is a concentration (basically a more scientific term than a %). It’s measured in mmol/mol - milli-moles per mole - basically parts per thousand, I suppose. The percentage figures we used to use were too similar to the home meter readings we get and can cause confusion. For example, an HbA1c of 50 is roughly 7% under the old system - but this is an average of over 8mmol/l on your own meter - hence a lot of confusion and our adoption of the IFCC system. Makes the two types of test have completely different numbers.
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More sciencey bits, if you really want them!
* One mole of a
chemical substance contains 6.02214076×10^23 molecules - so the bigger a molecule of something is, the more one mole of it weighs. This number is one of the universal constants, like gravity, and is called Avogadro’s Number.
**HbA1c is a measure of the beta-N-1-deoxy fructosyl component of hemoglobin. The origin of the naming derives from Hemoglobin type A being separated on
cation exchange chromatography. The first fraction to separate, probably considered to be pure Hemoglobin A, was designated HbA0, the following fractions were designated HbA1a, HbA1b, and HbA1c, respective of their order of
elution.
Hope that helps
