Hi. Just put my new capture on, and keep having to scan it as says lost signal. My sugars have seemed higher though I have changed nothing. So, to double check took the blood sample. Currently libre shows 14, but sample shows 10. Does this difference sometimes happen? I’m wondering if the libre is faulty.
-
Please Remember: Members are only permitted to share their own experiences. Members are not qualified to give medical advice. Additionally, everyone manages their health differently. Please be respectful of other people's opinions about their own diabetes management.
Difference in reading between libre 2 and usual pinprick monitor.
- Thread starter Catlady 1
- Start date
trophywench
Well-Known Member
- Relationship to Diabetes
- Type 1
Bear with it until quarter to four then FP again and compare. If still that far out, ring Abbot, tell them and ask them to replace the sensor.
They sometimes do take a while to 'bed in' and start giving true results.
They sometimes do take a while to 'bed in' and start giving true results.
There are a few things to consider with CGMs like Libre due to limitations of physics.
These are described in a sticky thread: https://forum.diabetes.org.uk/boards/threads/cgm-limitations-and-precautions.108188
Three things here may be relevant
- You mention you just put your new sensor on. Some of us find we experience “insertion trauma” - our bodies react to the alien object in our arm and can take a day or two to get used to it. Therefore some of us insert our Libre a day before starting it.
- CGMs are most accurate at “normal” levels and can overegg high readings (over 10mmol/l). They are less accurate if your Bag is running in this higher range.
- CGMs and home testing finger prick meters need to comply with accuracy of +/- 15%. For example, if a lab test measured your BG as 12, a CGM or finger prick could read anything between 10.1 and 13.9 to satisfy this standard.
For these reasons, there is nothing to suggest your cgm is faulty with regard to accuracy.
These are described in a sticky thread: https://forum.diabetes.org.uk/boards/threads/cgm-limitations-and-precautions.108188
Three things here may be relevant
- You mention you just put your new sensor on. Some of us find we experience “insertion trauma” - our bodies react to the alien object in our arm and can take a day or two to get used to it. Therefore some of us insert our Libre a day before starting it.
- CGMs are most accurate at “normal” levels and can overegg high readings (over 10mmol/l). They are less accurate if your Bag is running in this higher range.
- CGMs and home testing finger prick meters need to comply with accuracy of +/- 15%. For example, if a lab test measured your BG as 12, a CGM or finger prick could read anything between 10.1 and 13.9 to satisfy this standard.
For these reasons, there is nothing to suggest your cgm is faulty with regard to accuracy.
Lucyr
Well-Known Member
- Relationship to Diabetes
- Type 1
Doubt they’ll replace based on 2 fingerpricks on day 1. They usually want 3 fingerpricks and to have been on at least 24 hours
Martin.A
Well-Known Member
- Relationship to Diabetes
- In remission from Type 2
And even then only 95% of the time, I believe?
Bruce Stephens
Well-Known Member
- Relationship to Diabetes
- Type 1
Yes, that sometimes happens. They're both saying "somewhat too high", but try not to read too much more into the values than that. Compare them when one (and both, we hope) are more in the normal range (4-8, say).
Lucyr
Well-Known Member
- Relationship to Diabetes
- Type 1
Yep 5% of the time ie one in 20 tests it can be as far out as they like
Yes, bit too high but not long after eating. I am new to insulin, was trialing no jardiance (can confirm sugars rose as a result, taking it again), and just had a GAD result of 34, so I suppose just being a bit anxious at the mo. You are right, I’ll keep an eye on it using both methods, and not worry too much.