Just a Mathematician

Just a little formulating to do this morning to try and predict Sarah's BG levels.  

With a 1:12 Carb/Insulin Ratio 

50 (1 unit drops bg by 50mg)
divided by 12(ratio) = raise bg by 4 mg per carb 

so we conclude 1 carb raises bg by 4 mg or points 

With a 1:10 Carb/Insulin Ratio 

50 divided by 10= raise bg by 5 mg per carb

so we conclude 1 carb raises bg by 5 mg or points 

Today

Sarah had 14 carbs for breakfast  

She was on a 1:10 ratio 

50 divided by 10 = 5 mg per carb
14x5= raise blood by 70 mg 

Morning BS was 149
149+70=  raises her bg to 219 without any insulin 

She took 1.5 units of insulin which will drop her 75mg in four hours which should put her at 

219-75= 144. 

2.5 hours after her breakfast bg was
157. 

219-157=  bg dropped 62 mg in 2.5 hours. 

Still having (.5 of her insulin left) it will drop her another 25mg in the next two hours.  

157-25= 132  4 hours after breakfast 

She had 5 carb snack at 2 hour check. 

5x4= 20 uncovered carbs 

132+20 = 
Now bg will be 152 four hours after breakfast.  ****In theory

Do you think that the formula actually worked? No

Four hours after her morning insulin and breakfast, she was 105.  

No amount of formulating can predict what a person's bg will do.