Why the glucose measurement unit is different in UK ?

Units[edit]
The international standard way of measuring blood glucose levels are in terms of a molar concentration, measured in mmol/L (millimoles per litre; or millimolar, abbreviated mM). In the United States, West-Germany and other countries mass concentration is measured in mg/dL (milligrams per decilitre).[5]

Since the molecular weight of glucose C6H12O6 is 180, the difference between the two units is a factor of 18, so that 1 mmol/L of glucose is equivalent to 18 mg/dL

Chandradev819 said:

Why the glucose measurement unit is different in UK ? Is there some special reason behind this ?

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As you can see from @Robinredbreast's post, mmol/l is the international standard. It's not so much that we're different, it's just some other countries try to be

There's a handy converter here:

http://www.diabetes.co.uk/blood-sugar-converter.html