Correction Factor
When your blood sugar goes unexpectedly high,
Diabetics: How to Calculate High Blood Glucose Correction Using the Rule of 1800
a correction bolus can be used to bring it down. To use the right correction bolus, you first determine your correction factor. The 1500 Rule for Regular was originally developed by Paul Davidson, M.D. in Atlanta, Georgia. Because the blood sugar tends to drop faster and farther on Humalog and Novolog insulins, we modified the 1500 Rule to an 1800 Rule for these insulins. (Some use a 2000 rule for these insulins.) The 1800 Rule shows how far your blood sugar is likely to drop per unit of Humalog and Novolog insulin. The 1500 Rule shows how far it will drop per unit of Regular.
Numbers between 1600 and 2200 can be used to determine the correction
factor. The number 1800 should work when the TDD is set correctly and the basal
insulin makes up 50% of the TDD in someone with Type 1 diabetes. A number
smaller than 1800 will work better when basal insulin doses make up less than
50% of the TDD, while a number higher than 1800 works better for those whose
basal doses make up more than 50% of their TDD. Also recheck your TDD and basal
percentage to make sure they are correctly set.
Setting up your correction boluses can be done only after your basal doses
have been tested for accuracy. If your basal doses are set too high, using a
correction bolus may lead to lows, while basal doses that are too low will make
it appear that correction boluses are not the right amount to bring high
readings down as expected.
The 1800 Rule:
·
Works for Type 1 diabetes
and most Type 2s
·
Estimates the
point drop in mg/dl per unit of Humalog or Novolog
·
1800/TDD = point
drop per unit of Humalog (see Table)
·
Example:
Someone's Total Daily Dose of insulin = 30 units
1800/30 u/day = a 60 point drop per unit of Humalog
Someone's Total Daily Dose of insulin = 30 units
1800/30 u/day = a 60 point drop per unit of Humalog
·
The 1800 Rule
allows you to set up an accurate personal Sliding Scale to lower unwanted
highs!
The 2200 to 1600 Rules
2200 Rule
|
2000 Rule
|
1800 Rule
|
1600 Rule
|
|
Total Daily
Insulin Dose |
Point Drop
per unit of Hum. or Novolog |
Point Drop
per unit of Hum. or Novolog |
Point Drop
per unit of Hum. or Novolog |
Point Drop
per unit of Hum. or Novolog |
20
|
110 mg/dl
|
100 mg/dl
|
90 mg/dl
|
80 mg/dl
|
25
|
88 mg/dl
|
80 mg/dl
|
72 mg/dl
|
64 mg/dl
|
30
|
73 mg/dl
|
67 mg/dl
|
60 mg/dl
|
53 mg/dl
|
35
|
63 mg/dl
|
57 mg/dl
|
51 mg/dl
|
46 mg/dl
|
40
|
55 mg/dl
|
50 mg/dl
|
45 mg/dl
|
40 mg/dl
|
50
|
44 mg/dl
|
40 mg/dl
|
36 mg/dl
|
32 mg/dl
|
60
|
37 mg/dl
|
33 mg/dl
|
30 mg/dl
|
27 mg/dl
|
75
|
29 mg/dl
|
27 mg/dl
|
24 mg/dl
|
21 mg/dl
|
100
|
22 mg/dl
|
20 mg/dl
|
18 mg/dl
|
16 mg/dl
|
The 2200 to 1600 Rules
|
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