Hi Rose, well only yesterday on a type 1 diabetes course we were told this; If your glucose levels are above 14, then test for ketones. If you have ketones but they are below 0.6 then keep an eye on your glucose levels and if you cannot get them down or are feeling dreadful, get medical advice. If the ketones are over 0.6 but under 3 then seek medical advice, if over 3 then 'A&E', (nice rhyme). So.….when your glucose was 20, your ketones were 0.1? It's not always an exact science though so I would always err on the side of caution and ketos or not, if my levels remained high despite any insulin I would seek medical advice. Hope this helps. As an aside, when I was diagnosed I had off the roof glucose levels and very high ketones in the 4s, I felt absolutely FINE so you don't always get symptoms. DKA can come on as rapidly as sepsis they said so please don't take any chances. x