<s>[INST] My dad is in the hospital for a pulmonary embolism. He is now getting accu checks and insulin coverage for blood sugar over 200. He has never been diagnosed with diabetes so why are they suddenly checking and giving him insulin. The highest it has been in three days is 227. Just not sure why he is being treated for that. Does it have to do with the heparin and Coumadin? [/INST] Thanks for your question on Chat Doctor. Pulmonary embolism is life-threatening condition. And in any such conditions or severe infection glucose levels tend to fluctuate a lot. So it is not recommended to use oral glucose lowering Chat Doctor.  So insulin is preferred.  Because action of insulin is immediate so better to control sugar spikes and avoid delayed hypoglycemia. And high sugar levels are not due to heparin or Coumadin. So no need to worry about this. No harm in insulin injection for high sugar levels. </s>