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Message: <blockquote data-quote="DiabeticGeek" data-source="post: 25172" data-attributes="member: 7961">The only way to be certain which type you have is something called a C-peptide test.  Most T1 diabetics have very low levels of C-peptide (or none at all), whereas T2 diabetics usually have either normal or raised levels.  This is a test that has to be done in a lab - and that, no doubt, is what your doctor is waiting for.You are right in thinking that metformin won't do anything for T1.  You have been given it because a BG level of 20 mmol/l is extremely high, and your doctor will want to get it down as soon as possible.  If you have T2 then this should work, and you are likely to be on metformin for a while (maybe permanently, maybe not).  If, on the other hand, it is T1 the metformin won't help although it won't have done any harm.  If that is the case you can expect the metformin to be stopped and you will be put onto insulin (all T1 diabetics need insulin).  The reason that you have been given low doses of metformin initially is that some people do get side effects (stomach cramps, wind, diarrhoea etc.), which usually go away when you build up tolerance to the drug.  Starting on a low dose and building up to a higher one is a good way to do this - and quite often can mean that there are no side effects at all.(edited by Dennis)</blockquote>

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