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How reliable are HbA1c tests?
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<blockquote data-quote="Mbaker" data-source="post: 2224856" data-attributes="member: 256617"><p>I have done a lot of testing using about 6 blood glucose monitors (2 synchronised with my Doctors Surgery), A1CNow kits and FreeStyle Libres. Long story short for me was that, my HbA1c appeared to get slightly worse despite testing, and lowering my fbg by a full point and not getting spikes. So much testing that it has damaged my ability to use certain fingers for biometric security systems.</p><p></p><p>Like a dog with a bone I would not let the "discordance" between my fasting (circa 3.8 - 4,4) and post prandial (no more than 6, but usually circa 5.4) readings go unchallenged. I needed to understand why I could be a HbA1c of 39 with such low meter readings across multiple different devices, and the A1CNow multiple tests at circa 31, which would have appeared closer to what my meters were saying. In order to see if I was getting spikes I have tested for a couple of years many times with the Libre FreeStyle, where I only found 1 reading of I think a 6.5 post prandial, which was due to either sweetened sausages and or the mash made of swede, butternut squash and parsnips.</p><p></p><p>After some questions on this site [USER=94045]@Bluetit1802[/USER] said she tested on another assay, which produced a lower result. I did 2 tests at Medichecks, one assay was the same type my hospital uses and the other was another type [USER=94045]@Bluetit1802[/USER] mentioned. The first test was the same result as my Doctors test, the other was 4.5 mmol/L lower. I believe for some eating more red meat / other protein potentially extends the life time of the red blood cells. This I have heard several times in podcasts, coincidentally this one earlier today.</p><p></p><p>[MEDIA=youtube]u9g3E9nobCQ[/MEDIA]</p><p></p><p>I now test less often, but notice no matter what device I use, my average is always 4.4 mmol/L</p><p></p><p>[ATTACH=full]39038[/ATTACH]</p><p></p><p>So now I just rely of fbg and post prandial readings mainly, as my diet is quite settled. So what I have learned in my n of 1 is that even with a full point drop in fbg, other "things" could keep HbA1c's high out of step "discordance" with accurate meter readings; so the important thing is what is the variance from a known accurate point.</p></blockquote><p></p>
[QUOTE="Mbaker, post: 2224856, member: 256617"] I have done a lot of testing using about 6 blood glucose monitors (2 synchronised with my Doctors Surgery), A1CNow kits and FreeStyle Libres. Long story short for me was that, my HbA1c appeared to get slightly worse despite testing, and lowering my fbg by a full point and not getting spikes. So much testing that it has damaged my ability to use certain fingers for biometric security systems. Like a dog with a bone I would not let the "discordance" between my fasting (circa 3.8 - 4,4) and post prandial (no more than 6, but usually circa 5.4) readings go unchallenged. I needed to understand why I could be a HbA1c of 39 with such low meter readings across multiple different devices, and the A1CNow multiple tests at circa 31, which would have appeared closer to what my meters were saying. In order to see if I was getting spikes I have tested for a couple of years many times with the Libre FreeStyle, where I only found 1 reading of I think a 6.5 post prandial, which was due to either sweetened sausages and or the mash made of swede, butternut squash and parsnips. After some questions on this site [USER=94045]@Bluetit1802[/USER] said she tested on another assay, which produced a lower result. I did 2 tests at Medichecks, one assay was the same type my hospital uses and the other was another type [USER=94045]@Bluetit1802[/USER] mentioned. The first test was the same result as my Doctors test, the other was 4.5 mmol/L lower. I believe for some eating more red meat / other protein potentially extends the life time of the red blood cells. This I have heard several times in podcasts, coincidentally this one earlier today. [MEDIA=youtube]u9g3E9nobCQ[/MEDIA] I now test less often, but notice no matter what device I use, my average is always 4.4 mmol/L [ATTACH=full]39038[/ATTACH] So now I just rely of fbg and post prandial readings mainly, as my diet is quite settled. So what I have learned in my n of 1 is that even with a full point drop in fbg, other "things" could keep HbA1c's high out of step "discordance" with accurate meter readings; so the important thing is what is the variance from a known accurate point. [/QUOTE]
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