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Type 1 Diabetes
Freestyle Libre Calibration
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<blockquote data-quote="In Response" data-source="post: 2396632" data-attributes="member: 527103"><p>You will have these statements many times on this forum but it is always worthwhile reminding ourselves</p><p>- CGMs (and Libre) do not measure blood sugars. They measure interstitial fluids which is a different thing.</p><p>- We are all different. Some of us may have a 5 minute delay of finger pricks behind CGMs, some of us have 20 minute delays</p><p></p><p>The other things to remember are</p><p>- the delay is not constant. If our blood sugars are changing quickly, the difference may be more </p><p>- CGM manufacturers use an algorithm to convert interstitial fluid readings to blood sugar readings. They include some prediction within this algorithm to minimise the delay. They (believe they) are getting better with their predictions so may suggest they are not as far behind. </p><p></p><p>And, when I think is the most important thing</p><p>- much of what we measure and count with diabetes is an approximation. Finger prick readings and CGM readings are as approximate as carb counting. So, getting worrying about 15 minute, 20 minute, 5 minute or any other delay isn't worthwhile in the overall scale of approximations as long as we realise there is likely to be a delay and to back up CGM readings with finger pricks if we are going to make corrections. (Actually, the OP doesn't say whether they are taking insulin so I don't know if this is relevant)</p></blockquote><p></p>
[QUOTE="In Response, post: 2396632, member: 527103"] You will have these statements many times on this forum but it is always worthwhile reminding ourselves - CGMs (and Libre) do not measure blood sugars. They measure interstitial fluids which is a different thing. - We are all different. Some of us may have a 5 minute delay of finger pricks behind CGMs, some of us have 20 minute delays The other things to remember are - the delay is not constant. If our blood sugars are changing quickly, the difference may be more - CGM manufacturers use an algorithm to convert interstitial fluid readings to blood sugar readings. They include some prediction within this algorithm to minimise the delay. They (believe they) are getting better with their predictions so may suggest they are not as far behind. And, when I think is the most important thing - much of what we measure and count with diabetes is an approximation. Finger prick readings and CGM readings are as approximate as carb counting. So, getting worrying about 15 minute, 20 minute, 5 minute or any other delay isn't worthwhile in the overall scale of approximations as long as we realise there is likely to be a delay and to back up CGM readings with finger pricks if we are going to make corrections. (Actually, the OP doesn't say whether they are taking insulin so I don't know if this is relevant) [/QUOTE]
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