We are new to pumping and are having a problem tonight that I hope you all can help me understand. Went out to dinner (high fat meal) around 6 then to karate (went low and treated at 7:30). Dexcom graph shows a clear rise starting right when we treated the low. But rather than stopping the rise continued right up until the Dex only read "High". We could not correct early because there was insulin on board from dinner but we did correct around 8:30 then again at 9. The pump would not let us do a very large correction do to IOB at these times. According to the graph on the Dex the corrections had no effect. At 10:00 when she was 385 on the meter I did another correction. She came down to 350 over the course of the next hour but then started to go up again. Checked BG on the meter (350) and checked for ketones which were .2. At this point I looked at the tubing and it was not an even color all the way along its length. It did not quite look like air bubbles in the tube but I am thinking that is the most likely reason for the discoloration. The pump was delivering the correction at this time and I did not see any movement of what I suppose were air bubbles. So my questions are: do you think these are air bubbles? Can I disconnect the tube and purge the bubbles if that is what they are. She has about 36 units left in the pump, does that make a difference? She ran a 5k run earlier today, could that cause air bubbles? Would air bubbles cause less insulin to be delivered (causing a high) but still allow some to be delivered (causing not too much ketones and some reduction of a high)?