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If you use Regular insulin: If your total daily dose of insulin were 30, then 1500 divided by 30 = 50, meaning that 1 unit of Regular insulin would drop your blood glucose approximately 50 mg/dl.
If you use Humalog (and likely the same would apply for Novolog): If your total daily dose of insulin were 30, then 1800 divided by 30 = 60, meaning that 1 unit of Humalog or Novolog would drop your blood glucose approximately 60 mg/dl.
Not that I would use this sensitivity calculation to get the amount of insulin I would need to lower my BG (fear of over-bolus because I have insulin still in me). My pump does that calculation and so far has kept me in the mid-80s to lmid-90s reliably. Just wanted to know what the general ratio was out of curiosity.
The books I've seen on Pumping Insulin provide some starting point guides on 2 ratios. The first is the one you mention, and the second is the computation for how many carbos one unit will cover.
The specific ratios for each of us is best computed with the help of a CDE ... not because the math is hard (it isn't) but because of the specifics that can play a role in why our ratios would be higher/lower and what factors might suggest we need to change our ratios over time.
Am I reading this correctly?