How much does 1 unit of insulin bring down blood sugar mmol?
For example, a ratio of 1:2 means that one unit of insulin will drop your blood glucose level by 2mmol/L. Therefore, if a person with an ISF of 1:2 needs to lower their blood glucose from 10 mmol/L down to 6 mmol/L (ie by a total of 4 mmol/L) they will need to take two units of insulin.