My mother and I recently did an oral glucose tolerance test while wearing CGMs and discovered that in us, the CGM measurements (Dexcom G7) and the reference instrument measurements (whatever Quest Diagnostics uses) virtually _never_ lined up, even when including the G7's advertised error margins. The blood glucometer readings in me didn't line up either. Admittedly this was on the first day using the G7, when it's apparently less accurate, but due to this I've been doubtful of CGM readings in me/her. I'm sure CGMs work on a population level, but for us, on that day? Nope.

My graph: https://i.imgur.com/FzPdH1g.png

Mom's graph: https://i.imgur.com/5DR1G30.png

Discussion: https://reddit.com/r/PeterAttia/comments/1k301o4/my_ogtt_exp...