Kevin
What were you levels like for the several days before???? Remeber it can take time to flush out ketones if the body has started to go into DKA at any one point and the situation has been recified..
It is possible to get DKA with lowish BG's I know it happened to me and I ended up spending almost a month in hospital My BG hadn't gone above 8mmol/ml, but I started to vomit etc, didn't think much about it, and it was only a off chance visit from my midwife, that I realised I was in trouble, I actually thought that I caught a playground bug off my daughter as my BG was pretty normal...
I was sent to hospital, put on a sliding scale for almost a fortnight, then I wasn't allowed home until my urine was clear of ketones for 24 hours... And believe me it's the real pits, when you hope of going home are up, as you get near to the 24 hours mark, and no ketones only to find that the little blighters reappear at the 23 hour mark and you got to wait until they clear and start all over again :evil:
If you are on a low carb diet (extremely low carb) then perhaps having a normal range bg and a very low level of ketones, may be the diet..
But after expercining low level BG's and ending up DKA even though it was almost 19 years ago, I still remember it very well, and I personally wouldn't rely on some on the internet saying 'it nothing don't worry' exspecially if I had top marks on the ketone stick I would be off to seek medical advice...
Once you expericend DKA you won't want to suffer it again in a hurry..