If your pre meal glucose level is low, then you need to correct it by having 15 grams of carbohydrate and then you can take your normal insulin. If it is the morning reading that is low, then you need to try and work out why it went low(exercise, alcohol or dose to strong etc), as you may need your long acting insulin dose adjusted. If it is short acting insulin that you are about to give before a meal, and your glucose is low, then you need to give 15 grams of carbohydrate and recheck 15 minutes later. Based on the repeat reading you can then adjust your short acting insulin as you normally would(carb ratio, insulin sensitivity etc)
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