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The Insulin : C-peptide Ratio

Updated: Nov 16, 2023

We recently identified the manufacturer of the blood test kit used to test for insulin and c-peptide.


As a quick reminder, the prosecution alleged that Lucy Letby poisoned two babies with insulin. As proof of this accusation they pointed to the fact that a blood test revealed that the babies had high insulin and low c-peptide.


Although this finding can be associated with administration of exogenous insulin it is not definitive proof. In particular, if there are limitations with the parameters of the blood test it may not be possible to measure the actual concentration in the blood if the analyte being tested is too high.


Watch the video below to find out more:







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15 Comments


I found the individual screens display time too short, didn’t give me enough time to read and digest the information before moving on to the next screen, also found the music too loud and distracting, could do with turning the volume down.

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Hi that’s great news you’ve identified the manufacturer!

The most important thing to do now is get them to comment on the validity of the test result. THIS COULD BLOW THE WHOLE CASE WIDE OPEN!

Who are they?? Will you be doing a further post with info about them?

We need more details please.

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Replying to

Yes, having the test kit manufacturer actually comment on the obviously invalid result would be most important.

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Ron Winter
Ron Winter
Nov 06, 2023

"We recently identified the manufacturer of the blood test kit used to test for insulin and c-peptide."

Is the manufacturer able to specify the maximum insulin concentration for which the test was valid? Has the manufacturer been asked to comment on the reported test results?

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Yes... of course the "insulin poisoning" is a hypothesis without foundation on several levels.

One is the testing method used and whether the result was even valid, per the parameters of the testing kit/procedure itself? Answer: no.

Another is the fact that whatever "insulin analogue" used on the NNU, was it specifically tested for and found in the neonates? Answer: no.

Was there any evidence showing missing vials or tampering/unexplained usage of insulin in proximity to the "collapse" of those two neonates? Answer: no.

Was there any evidence that Nurse Letby secreted away any insulin vials or was found with syringes containing insulin... or witnessed administering unscheduled meds to either of the "victims of poisoning"? Um, no.

So... I think…

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Ron Winter
Ron Winter
Nov 06, 2023

Bit confused. In the previously published article "The Insulin Evidence....Disagreeable facts" it was pointed out that an insulin concentration of 4657pmol/L was impossible but in this video it seems to be assumed that the 4675pmol/L reading was correct. Or have I got it wrong?


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Replying to

"There doesn’t seem to be a single simple reason to explain both the discordant insulin/ cpeptide ratio AND the high insulin unless the claim is that the test was invalid." Yes Helen, that is what I was thinking as well, and like so many aspects of "medical science" is indeed, multifactorial and nuanced.

Another reason why, this entire business should have never gone to the legal system, barristers and a lay jury... nor a bogus expert ("hired gun") like Dewy Evans.

IF each "unexpected collapse" had been properly reviewed, in a timely manner by the NHS/CoCH ... then I think "root causes" would have been identified, or be seen as due to many interwoven failings at CoCH NNU to meet…

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