I had this fairly recently
@lizziewizzie. It was a pint. Owwwww. I kept testing an correcting but didn't feel right for a couple of days.
Next time when I wasn't sure I wanted to check - I keep meaning to get hold of some glucose strips for urine testing but haven't ever got round to it. They'd tell you like a shot! Tested some Diet Coke with my meter/pump handset a few months ago as it tasted very syrupy - it measured 0.6mmol/l - so I was quite safe with that.
Problem was, I had some explaining to do to my consultant about that mad result musing up my 'blood glucose' averages. 'Yeah, that wasn't blood, it was a Diet Coke test... Ahem..