I’m on an accutest expert which I was told to program as follows..... 1 unit of insulin to 10g of carbohydrate initially. The nurse adjusted it as time went on. It says units of insulin on the left, and grammes of carbohydrates on the right? Maths is my weak point so I’m totally confused now
It does seem like maybe you and /or your DSN don't understand the ratios. So, to keep them as simple as possible, try and keep the ratios as 1 unit covers X grams of carbs. That way, to work out how many units you need to cover a meal you just divide the total grams of carbs by X.
So if your ratio is 1:10 and you're eating 30g of carbs you divide 30 by 10 to get 3 units you will need to take to cover 30g.
If you're on a 2:X ratio that just adds another step to the maths and over complicates things as to work out how much insulin you'd have to dived the total carbs by X then times by 2.
So, if you keep the ratio at 1:X hopefully that keeps it simpler and it makes it easier to compare what the ratios actually mean. The important thing for you to bear in mind would be that as the X value gets lower the insulin you take increases.
So, with a
30g carb meal and various ratios lets see how the insulin dose varies:
1:10 3u
1:3 10u
1:1 30u.
So, the lower X is (i.e. the number on the right hand side, which represents the number of grams of carbs 1 unit covers in a 1:X ratio) the more insulin you take.
And, you can work it backwards to figure out what ratio you used for breakfast this morning when you had 7 units to cover 25g of carbs by dividing 25 by 7 = 3.5. So this morning you used a 1:3.5 ratio.
It does seem like a 1:3.5 ratio doesn't work very well for you. But that would be expected as you have previously said your ratios are "generally around 1:3-1.5" and 3-1.5 are lower numbers than 3.5, meaning you would apparently usually take more insulin to cover this meal. Remember, lower number for X means
more insulin is needed.
If you had been using a 1:1.5 ratio, which previously you had indicated you were supposed to be using, you would have had 16units (25/1.5 =16.666).