Old Insulin

Does anyone out there get higher BG Readings when your pump.is filled with the insulin that finishes the bottle? If so, what do you do?

I have noticed higher readings when my reservoir is getting low (i think it’s exposed to higher temps), but not really when the bottle is getting low. If you are only using a small amount of insulin it could be that the insulin is too old before you are getting to the bottom? I was told to throw it out after 28 days. I have used it slightly longer without issue though. Maybe keeping it in the fridge will help? Are you creating a lot of bubbles when you extract insulin from the bottle? If so, that could also explain it.