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- 8,470
- Type of diabetes
- Type 2
- Treatment type
- Tablets (oral)
For 5 years now I have been parallel testing using two meters on the same drop of blood. One meter was supplied by my GP and is a Caresense Dual. The other is an SD Codefree meter. I have kept my results in an EXCEL spreadsheet as part of my food and medication log. I no longer test my fasting or breakfast levels and only test my main meal in the evening. This meal is the one I vary, and I follow a fixed eating pattern with minimal snacking during the day. I am a couch potato with zero exercise.
I have always seen that the Codefree persistently reads higher than the dual and it is fairly predictable, so I can accept this as a fixed offset which I average out.
I have just done an analysis of the last 100 days of readings to compare both meters against each other, and looking to see if there is any trending pattern by doing trend analysis.
The first thing I find is that when I examine the differences between the two meters, the SD Code-free and the Dual do track each other with a fixed offset that has zero change over time for all the PRE-Meal readings. This means that at a pseudo fasting level they agree pretty well with a constant difference, confirming my original findings.
When I come to the 2HR PP readings, the difference between the meters increases significantly, by typically 2 mmol/l and up to 2.4 mmol/l extra error on top of the Pre Meal offset. The trend line for this graph shows the error increasing over time up to nearly 3 mmol/l difference.
The 4HR PP readings track about halfway between these two extremes, by also rising but at a lesser rate.
So this indicates that something is affecting the accuracy of the SD Codrfree more than the Dual. It could be just that the values being read are higher and thus eating into the ISO error budget allowance. But normally this higher post-prandial reading is only a couple of mmol/l rise above the PRE so I do not think this is to blame.
I suspect that the different chemistries used in both meters is giving different reactions to something in my blood that changes when I eat a meal. It is not in the PRE readings, so when at homeostasis I find they both track. Something in the blood is changing over time in my body.
I have not had a whole blood panel done for nearly 2 years now due to Covid, so I am missing that vital information. I suspect it may be anemia, or LDL content, or increasing infection that is interfering with my meters. Or maybe the SD is more sensitive to Chylomicrons or SFA. Anemia and infection are probably out of the picture since that would affect the PRE readings too. So I suspect it is something temporary that happens following a meal that subsides gradually over time such that at about 6 hours, homeostasis is regained. And it seems only the SD is sensitive to it,
Anyone else got any ideas about what could be affecting the meter? This is over 100 samples, so is not due to any particular meal. I am generally low carbing and cooking from scratch, but there are some processed meals in the mix.
I have always seen that the Codefree persistently reads higher than the dual and it is fairly predictable, so I can accept this as a fixed offset which I average out.
I have just done an analysis of the last 100 days of readings to compare both meters against each other, and looking to see if there is any trending pattern by doing trend analysis.
The first thing I find is that when I examine the differences between the two meters, the SD Code-free and the Dual do track each other with a fixed offset that has zero change over time for all the PRE-Meal readings. This means that at a pseudo fasting level they agree pretty well with a constant difference, confirming my original findings.
When I come to the 2HR PP readings, the difference between the meters increases significantly, by typically 2 mmol/l and up to 2.4 mmol/l extra error on top of the Pre Meal offset. The trend line for this graph shows the error increasing over time up to nearly 3 mmol/l difference.
The 4HR PP readings track about halfway between these two extremes, by also rising but at a lesser rate.
So this indicates that something is affecting the accuracy of the SD Codrfree more than the Dual. It could be just that the values being read are higher and thus eating into the ISO error budget allowance. But normally this higher post-prandial reading is only a couple of mmol/l rise above the PRE so I do not think this is to blame.
I suspect that the different chemistries used in both meters is giving different reactions to something in my blood that changes when I eat a meal. It is not in the PRE readings, so when at homeostasis I find they both track. Something in the blood is changing over time in my body.
I have not had a whole blood panel done for nearly 2 years now due to Covid, so I am missing that vital information. I suspect it may be anemia, or LDL content, or increasing infection that is interfering with my meters. Or maybe the SD is more sensitive to Chylomicrons or SFA. Anemia and infection are probably out of the picture since that would affect the PRE readings too. So I suspect it is something temporary that happens following a meal that subsides gradually over time such that at about 6 hours, homeostasis is regained. And it seems only the SD is sensitive to it,
Anyone else got any ideas about what could be affecting the meter? This is over 100 samples, so is not due to any particular meal. I am generally low carbing and cooking from scratch, but there are some processed meals in the mix.