The smaller number is mmol/L, and is the standard in the UK. The larger number is mg/dl, which is the standard in the US. Here is a useful converter: http://www.diabetes.co.uk/blood-sugar-converter.htmlHow BS is measured like 5.1 4.8. I normally read 120 105 on glucometer. H1ba test is measured 6.5 7.5 & so on.