We use a minimum of 110.  However, the first dive I like to see them at least in the mid 100 range. I monitor the diabetic carefully the first few dives to get an idea of their individual drop rate. If they tend to drop significantly (80-100 pts) I give them some fiber and fat pre dive to ensure when they come out of the camber they will be in that 100 - 110 range post dive. We are fortunate to have the diabetic educators located next door to the HBO room. I often consult them for individual pt menu planning for the HBO pts.