This reminds me of the old "sick-day rules". Insulin-dependent diabetics were taught to give 50% of their usual insulin dose on days when they were ill and would likely not be taking their usual diet. I'm not a diabetes educator, but my recent reading supports the idea that the body's sympathetic response to the stress of illness will increase the blood glucose level, and subsequently increase the amount of insulin needed. The usual insulin dose should be taken. In these days of glucometers and home testing for BGLs, I've most often seen patients in the community instructed to monitor their glucose levels more frequently on these days. They may be given an alternative scale, but in any case they would almost certainly be given BGLs for calling the practitioner. In a hospital, request new orders from the practitioner. An intermediate or long-term care facility may have standing orders, and your assessment will tell you when these orders are insufficient.