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Should C peptide be tested before starting medication?

Thanks HSSS, I eat fewer than 50g of carbs a day and when I test 2 hours after eating it usually goes up by less than 2 units. I have been testing when I wake up then before and 2 hours after every meal so 7 times a day since 2018 and I have only had a handful of tests that are under 7 in all those years but I rarely went above 11 then earlier this year my levels shot up into the high teens and low twenties when I had a new kitchen fitted and was eating ready meals and toast because I didn't have a cooker. I thought it would go back down when I went back to my usual diet but it is coming down really slowly.
I will ask for a print out of all my results.
I really appreciate your reply.
 
Hi,
It's been a long time trying to get the results of my C-peptide test and I have had a telephone consultation with a consultant at the Endocrine clinic this morning. I am producing 1800 units of insulin which he said is very high.
The last consultant refused to do a C-peptide test saying that he could tell from my high sugar levels that I was no longer producing much insulin at all and he wanted me to take dapaglifozin even though I told him that I eat a low carb diet. I refused.
New consultant wants me to take the oral version of semaglutide and I am not sure how I feel about that, he said that an injectable version would work better but there are supply difficulties. I think I need to talk things over with my GP before doing anything so keep your fingers crossed for me.
 
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