BG readingss help

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Regular Member

Date Joined Apr 2007
Total Posts : 160
   Posted 2/6/2010 10:20 AM (GMT -7)   
Hi I have been a diabetic for a long time and generally have pretty good BS readings but about a month ago I started getting some horrendous fasting readings .300-400 range.  My doc advised me to split my evening Lantus into a morning and evening.  I was taking 40 units.  He further advised that I slowly increase my Lantus.  I did that and now I am showing fastings BS's in the 100 -120 range.   Great!! However I am spiking around lunch time to the 200=220.  Then at dinner I am again having good readings even an episode or two of hypoglycemia.  Does any one have an idea to account for the noon time spike.  I am taking Novalog 1  unit to/5 carbs for the meal time insulin

When there are no more choices, tha decision is easy!

Lanie G
Forum Moderator

Date Joined Nov 2006
Total Posts : 5975
   Posted 2/6/2010 8:43 PM (GMT -7)   
Hi Ralph.  Are you type 1?  I don't use insulin so I can't offer any advice, but there are a couple of members who do and I'm sure they can give you their opinions soon.  Hang in there.
forum moderator - diabetes
diabetes controlled so far by exercise and a low/no carb diet

Regular Member

Date Joined Nov 2009
Total Posts : 205
   Posted 2/6/2010 11:01 PM (GMT -7)   
Hi Ralph,

People often have different insulin:carb ratios for different times of day, and insulin needs often change.

If your pre-meal numbers are good then you could try 1 unit/4g carbs at lunch time to avoid the spike. (Check with your doc if you are uncomfortable tweaking things yourself).

Veteran Member

Date Joined May 2006
Total Posts : 547
   Posted 2/7/2010 11:20 AM (GMT -7)   
Too many variables to determine which areas need to be tweaked without the aid of a logbook. Are you Type1 on MDI? (Sorry, Ralph, can't remember).

Are you splitting your Lantus 50-50 (20 units each dose)? I do 14U Levemir in the evening and 13U in the morning.

As mentioned, do you have an I:C ratio for each meal? Mine is 1:10-1:12-1:8 for breakfast, lunch, dinner respectively and 1:10 for evening snacks over 24 grams of carbs, for example.

Have you done some testing between 2:30-3:30AM? This can sometimes help determine Dawn Phenomenon or if your morning numbers are a rebound high from going low.. Have you tested at the 2-hour post prandial mark to see how you process particular meals?

If you're going low before dinner then RAISE your lunch I:C ratio from 1:5 to 1:6 or 7 (not lower j-web). Do you exercise in this time frame. That could contribute to your pre-dinner lows if you're not compensating for it (i.e. extra carbs for exercise).

Again, and I say it a lot, a logbook becomes invaluable when you're trying to tweak your insulin regimen. Patterns will emerge, I guarantee :-)
- Phishbowl (Type 1 since Jan'05 - Levemir, NovoRapid)
"What's Not Measured Is Not Managed"

"It is impossible for a man to learn what he thinks he already knows"-Epictetus

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