I’ve always wondered about the insulin results. It is perfectly possible for errors to be made during the drawing of blood samples, the way samples are transported to the lab, and how they are processed once they arrived.
Blood samples can be mislabeled and this is a recognised risk in a healthcare setting. This can occur due to human error or system issues. Human error is not incommon in busy wards and units. Even if a sample was labelled correctly on the neonatal unit, it’s possible for similar errors to occur in the labs when the blood samples are processed. Hospitals therefore implement strict protocols to minimise the risk.
If an error like this is suspected usually the patient would have the blood tests repeated, but we already know that this didn’t happen.
This might sound far fetched, it isn’t. It’s much more likely that an error like this occurred than a nurse poisoned a TPN bag with insulin.
The biochemist who gave evidence did not mention these risks, but it’s possible that doctors in this field do not fully appreciate how much these errors can happen. Biochemists are not on “the shop floor” processing the blood samples in the labs.