[beardface]

Summary: I have no citation but my understanding is that measuring insulin levels needs to be done from a blood draw, so a Freestyle Libre-type device wouldn't work.

The Freestyle Libre and regular continuous glucose monitors measure glucose in the interstitial fluid under the skin - not blood. This is why the numbers can be wildly different to a blood glucose test done via finger-prick.

From what I've seen while researching very low carb diets, insulin levels are incredibly important and influence a lot of body chemistry. For example, someone without type 1 diabetes can have a normal blood glucose but only because they're producing an enormous amount of insulin. A large amount of insulin in the blood will cause fat to be stored, so the patient puts on weight.

[village-idiot]

Sounds like what you’d be interested in is insulin sensitivity, the ability to control blood sugar with the minimal amount of insulin possible. Sadly this is also a huge pain in the butt to measure, and the only way I’ve heard is to spike your blood sugar and time how long it takes to return to normal.

I personally use a keto mojo to measure blood glucose and blood ketone bodies. I’m not diabetic so I don’t need to use it, but I’m a fan of being able to tell how far into ketosis I am.

[atomical]

Your example is someone without diabetes but referred to as a patient?

[beardface]

My comment wasn't clear; apologies. I was referring to someone who had blood drawn to test for and diagnose high insulin levels. I'd classify anyone having that test in a clinical setting to be a patient.