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04-12-2006, 05:59 PM
|  | Senior Member
I am a: Type 1.5 | | Join Date: Feb 2006 Location: Orlando, FL
Posts: 7,846
| | | DexCom Data Analysis
I started this new thread to post comparison data from the DexCom CGMS vs. blood glucose readings taken from the OneTouch Ultra meter.
Let the fun begin!
7:00 Sync Meter with Device
Time DexCom Ultra Error
4/12/06 7:37 PM 97 107 9.35%
4/12/06 7:50 PM 101 100 1.00% |
04-12-2006, 07:05 PM
| | Banned
I am a: Type 1 | | Join Date: Oct 2005 Location: San Jose, CA
Posts: 3,358
| | Quote: |
Originally Posted by Cyborg I started this new thread to post comparison data from the DexCom CGMS vs. blood glucose readings taken from the OneTouch Ultra meter.
Let the fun begin!
7:00 Sync Meter with Device
Time DexCom Ultra Error
4/12/06 7:37 PM 97 107 9.35%
4/12/06 7:50 PM 101 100 1.00% |
Lookin' good! Let's see how it does in hypo territory and hypers, and how consistent it is. I also would like to see a correlation of numbers, adjusted for the time lag of eight minutes. Isn't that the known time lag of the sampling method, compared to finger sticks?
Do you have fast moving bg's? I can rise 100 points in less than 30 minutes and drop at the same rate, or slightly faster. I'm looking forward to seeing how much of a lag there is with rapidly changing bg's.
Last edited by spike : 04-12-2006 at 07:08 PM.
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04-12-2006, 07:50 PM
| | Senior Member
I am a: Type 1.5 | | Join Date: Feb 2006 Location: Orlando, FL
Posts: 7,846
| | Quote: |
Originally Posted by spike I also would like to see a correlation of numbers, adjusted for the time lag of eight minutes. Isn't that the known time lag of the sampling method, compared to finger sticks? | Yes, I think the rep was quoting 7 or 8 minutes. That's why I'm taking back to back readings. If there are any discrepencies in the values, I don't want lag being used as an excuse. Quote: |
Originally Posted by spike Do you have fast moving bg's? I can rise 100 points in less than 30 minutes and drop at the same rate, or slightly faster. I'm looking forward to seeing how much of a lag there is with rapidly changing bg's. | My liver dump in the morning is pretty strong, but it's controlled by basal rate changes so I may not show a huge rise as when it wasn't controlled. I may go ahead and fast tomorrow till lunch and check my basals. |
04-12-2006, 09:59 PM
| | Senior Member
I am a: Type 1.5 | | Join Date: Feb 2006 Location: Orlando, FL
Posts: 7,846
| | | My fingers hurt!
7:00 Sync Meter with Device
Time DexCom Ultra
4/12/06 7:37 PM 97 107
4/12/06 7:50 PM 101 100
4/12/06 8:42 PM 85 82
4/12/06 8:54 PM 88 87
4/12/06 10:12 PM 87 101
4/12/06 10:22 PM 112 119
4/12/06 11:03 PM 173 154
4/12/06 11:18 PM 170 153
4/12/06 11:47 PM 174 154
4/12/06 11:57 PM 179 163 |
04-12-2006, 10:07 PM
| | Member | | Join Date: Feb 2006
Posts: 420
| | Quote: |
Originally Posted by Cyborg My fingers hurt!
7:00 Sync Meter with Device
Time DexCom Ultra
4/12/06 7:37 PM 97 107
4/12/06 7:50 PM 101 100
4/12/06 8:42 PM 85 82
4/12/06 8:54 PM 88 87
4/12/06 10:12 PM 87 101
4/12/06 10:22 PM 112 119
4/12/06 11:03 PM 173 154
4/12/06 11:18 PM 170 153
4/12/06 11:47 PM 174 154
4/12/06 11:57 PM 179 163 | Mine hurt just thinking about it! Do you think the agreement would differ depending on what your BG is when you sync it? You synced it when your BG was around 100. I wonder how different things would be if you synced it when your BG is 150.
With all this interest in your "experiment" do you feel a little like a lab rat? |
04-12-2006, 10:15 PM
| | Senior Member
I am a: Type 1.5 | | Join Date: Feb 2006 Location: Orlando, FL
Posts: 7,846
| | I'm not sure about the calibration since I did calibrate several times today before the final one at 7:00 pm. I just calibrated again and the device has resynced. I'm around 160 right now and I'm done for the night. So I guess I'll answer your question better in the morning...
And yes, I feel like I'm in a clinical trial where I pay for everything! I figure it this way, this information will be useful to many interested in CGMS technology. Also, if the device does not do what it says, it is under warranty.  |
04-12-2006, 11:18 PM
| | Banned
I am a: Type 1 | | Join Date: Oct 2005 Location: San Jose, CA
Posts: 3,358
| | Quote: |
Originally Posted by Cyborg My fingers hurt!
7:00 Sync Meter with Device
Time DexCom Ultra
4/12/06 7:37 PM 97 107
4/12/06 7:50 PM 101 100
4/12/06 8:42 PM 85 82
4/12/06 8:54 PM 88 87
4/12/06 10:12 PM 87 101
4/12/06 10:22 PM 112 119
4/12/06 11:03 PM 173 154
4/12/06 11:18 PM 170 153
4/12/06 11:47 PM 174 154
4/12/06 11:57 PM 179 163 |
I know this is asking a lot, but do you have any other meters with strips that you could double check the results with? I primarily use an US, but I also use a Compact and Flash. From my testing, I feel that: The Compact goes high, compared to the US, at around 230+. The Flash is a bit high compared to the other two, at hypo levels. Those deviations aren't consistent, so that erratic behavior, compared to the US, makes me leery of depending on the Compact at 200+ and the Flash at <75. My US keeps me safe. <g> |
04-12-2006, 11:45 PM
| | Senior Member
I am a: Type 2 | | Join Date: Feb 2006 Location: Virginia
Posts: 1,351
| | Quote: |
Originally Posted by Cyborg 4/12/06 10:12 PM 87 101
4/12/06 10:22 PM 112 119
4/12/06 11:03 PM 173 154 | My sympathy for your fingers. 
But, I wonder if you do a bit more, not testing, reporting. I.E., what happened after 10:12 to cause the spike?
That is, add in eating and other relevant events. Thanks. |
04-13-2006, 05:34 AM
| | Senior Member
I am a: Type 1.5 | | Join Date: Feb 2006 Location: Orlando, FL
Posts: 7,846
| | | I don't have any other meters except the UltraSmarts. I wanted to use the Ultra meter because I have test strips for that meter, I can use it to sync the DexCom device, it matches my UltraSmart exactly and is used by the DexCom people. If I had another meter and strips, I would endure the extra finger sticks for the better cause.
I will mark up the data more to help. For the data last night, I ate dinner at approximately 9 PM. I ate or did nothing else the entire evening except post on the forum and do a little work on the pc. The spike in bg was the delay in digestion from the Symlin. Remember, the "real" numbers are from the meter, not the CGMS unit, so the spike wasn't so big. |
04-13-2006, 05:55 PM
| | Senior Member
I am a: Type 1.5 | | Join Date: Feb 2006 Location: Orlando, FL
Posts: 7,846
| | | Fresh Data
Time.......................DexCom......Ultra
4/13/06 4:23 AM.......49.............70
4/13/06 4:25 AM Sync Meter with Device
4/13/06 6:59 AM.......110............92
4/13/06 7:11 AM.......115............90
4/13/06 8:00 AM.......114............109
4/13/06 8:09 AM.......109............96
4/13/06 8:11 AM Sync Meter with Device
4/13/06 8:41 AM.......121............100
4/13/06 8:51 AM.......119............104
12 Carb Breakfast @ 9:00 AM
Here I started taking the CGMS reading at the same time as the bg meter and 10 minutes afterwards (when I remembered)
4/13/06 10:57 AM......84/78.........78
4/13/06 1:17 PM.......78/82..........77
13 Carb Lunch @ 1:30 PM
4/13/06 3:27 PM.......141/143.......116
4/13/06 4:18 PM.......161.............124 - Received High Alarm
4/13/06 5:30 PM Sync Meter with Device
4/13/06 7:31 PM.......76/77..........79 |
04-13-2006, 06:07 PM
|  | Senior Member
I am a: Type 1 | | Join Date: Sep 2005 Location: Cincinnati, OH
Posts: 8,356
| | | Wow, those numbers are pretty off in some places. It appears easy to tell when a sync is going bad. I'm just amazed these things can't keep sync for a long time. A 141 and a 116 are suppose to be the same? If I didn't double check on that 141 and I bolused for it to bring me back down to 100 and I was really running 116, I could go near hypo. ANd I know when kids get their hands on this and even young adults, they WILL make corrections WITHOUT checking. This seems like a good help, but ONLY if used properly and without much trust.
__________________
●Blue Ash, Ohio Police Dispatcher
●Type 1 diabetic for 25 years (11 months old)
●Animas pumper since December of 2002
~IR 1000 (Dec. 2002-Jan. 2005)
~IR 1200 (Jan. 2005 - ?)
●LifeScan OneTouch UltraSmart Diabetes is an Art, NOT a Science. You must master the control by skills and not by knowledge alone. |
04-13-2006, 06:10 PM
| | Banned
I am a: Type 1 | | Join Date: Oct 2005 Location: San Jose, CA
Posts: 3,358
| | Quote: |
Originally Posted by JediSkipdogg Wow, those numbers are pretty off in some places. It appears easy to tell when a sync is going bad. I'm just amazed these things can't keep sync for a long time. A 141 and a 116 are suppose to be the same? If I didn't double check on that 141 and I bolused for it to bring me back down to 100 and I was really running 116, I could go near hypo. ANd I know when kids get their hands on this and even young adults, they WILL make corrections WITHOUT checking. This seems like a good help, but ONLY if used properly and without much trust. | Pray tell what good is any metering system if you can't rely nearly 100% on it's readings? So far, my US is the ONLY meter I trust. |
04-13-2006, 06:27 PM
| | Senior Member
I am a: Type 1 | | Join Date: Sep 2005 Location: Cincinnati, OH
Posts: 8,356
| | Quote: |
Originally Posted by spike Pray tell what good is any metering system if you can't rely nearly 100% on it's readings? So far, my US is the ONLY meter I trust. | Hmmmm, go to www.myspace.com and join the 10 or so diabetes forums over there. You will see what I mean. Kids leaving pump infusion sets in for 1-2 weeks at a time. They make correction factors based on what they feel without testing. They drive while they are 50 and figure they can make it home 20 minutes instead of stopping at a Shell station for food. Do I need to continue?
A mature diabetic needs to trust his meter. An immature diabetic just needs something to give him a number +/- 25%. I haven't used the Flash yet, although I would like to try, but I think I'm sticking to Lifescan meters only.
__________________
●Blue Ash, Ohio Police Dispatcher
●Type 1 diabetic for 25 years (11 months old)
●Animas pumper since December of 2002
~IR 1000 (Dec. 2002-Jan. 2005)
~IR 1200 (Jan. 2005 - ?)
●LifeScan OneTouch UltraSmart Diabetes is an Art, NOT a Science. You must master the control by skills and not by knowledge alone. |
04-13-2006, 06:31 PM
| | Banned
I am a: Type 1 | | Join Date: Oct 2005 Location: San Jose, CA
Posts: 3,358
| | Quote: |
Originally Posted by JediSkipdogg Hmmmm, go to www.myspace.com and join the 10 or so diabetes forums over there. You will see what I mean. Kids leaving pump infusion sets in for 1-2 weeks at a time. They make correction factors based on what they feel without testing. They drive while they are 50 and figure they can make it home 20 minutes instead of stopping at a Shell station for food. Do I need to continue?
A mature diabetic needs to trust his meter. An immature diabetic just needs something to give him a number +/- 25%. I haven't used the Flash yet, although I would like to try, but I think I'm sticking to Lifescan meters only. | I didn't think we were arguing, but from the way you phrased the first paragraph, I'm wondering if we are on the same page. I'm not disputing anything you wrote, but it seems irrelevant to the comment of mine that you quoted. I'm confused as to what point you are making, relative to my previous post.
Dave |
04-13-2006, 06:33 PM
| | Senior Member
I am a: Type 1 | | Join Date: Sep 2005 Location: Cincinnati, OH
Posts: 8,356
| | Quote: |
Originally Posted by spike I didn't think we were arguing, but from the way you phrased the first paragraph, I'm wondering if we are on the same page. I'm not disputing anything you wrote, but it seems irrelevant to the comment of mine that you quoted. I'm confused as to what point you are making, relative to my previous post.
Dave | I thought you were using some sarcasm towards me. But I got it now. My bad 
__________________
●Blue Ash, Ohio Police Dispatcher
●Type 1 diabetic for 25 years (11 months old)
●Animas pumper since December of 2002
~IR 1000 (Dec. 2002-Jan. 2005)
~IR 1200 (Jan. 2005 - ?)
●LifeScan OneTouch UltraSmart Diabetes is an Art, NOT a Science. You must master the control by skills and not by knowledge alone. |
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