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Hospitals dispense medication in a different way. I don't know exactly the method used there, so I won't comment on it.
IMO, no matter whether the bag had been changed or not, if it was still d10, that is a subtle sign that there may have been a different issue.
Glucose infusion rate is a calculation that professionals use to determine how much sugar is being given via IVF. There are multiple equations that can be used, but the easiest one, IMO is dextrose (as a percent decimal) times how may milliliters per kilogram per day of the fluid the baby is receiving times 0.69,which is a constant. It can be expressed as Dextrose * Volume * 0.69 = Glucose infusion rate (also abbreviated GIR) You can also use a calculator such as
this one to also come up with the same number.
Sources such as
this from a neonatal handbook suggests that when hypoglycemia is found, the GIR should be increased every time, to provide more glucose. If they were continuing to use D10 based fluid, it would be nearly impossible for them to have increased the GIR appropriately with every hypoglycemia measurement, IMO. IMO, the normal thing would be to hang a fluid with more dextrose, which would mean neither the original TPN or starter TPN would be appropriate, IMO. The baby improved when they finally increased the glucose to 15%.
The only other way the glucose would stay the same, with the same amount of insulin, is if they weren't actually treating the hypoglycemia ever, which is concerning to think about, IMO. So if there were 2 units of insulin the baby was getting, with a gir of 6, and they had low blood sugar, to continue having the same, low blood sugar, would be if they were not adjusting the GIR at all in 24 hours. This is just a logical following of the evidence presented. Baby had consistently low blood sugars that were largely not improving nor deteriorating, which would mean they were not increasing the amount of glucose they were giving, or the insulin was perfectly calibrated that when they increased the infusion of TPN, the insulin increased the perfect amount for the amount of dextrose in the bag.
No matter what, there are things that don't add up.