@rjones404 Welcome to Mayo Clinic Connect. I assume you are diabetic and are looking for information comparing continual glucose monitoring (CGM) results with lab results. Did I get that right? I use a Dexcom G6 (CGM) and an old fashioned glucometer for monitoring my glucose levels. At the start it was explained to me that lab levels and glucometers measure blood sugar. A CGM measures the sugar in the interstitial fluid of wherever the device is inserted. Any method can help track how you are doing overall. The lab level requires a lab and is a one time result. The glucometer level is also a one time result but you can have a glucometer at home and repeat the test as needed. The CGM is a 24/7 level that you wear on you. All these methods’ results can be converted to 3 month average picture of what is going on. That is a test called the glycosylated hemoglobin (HbA1C or A1C). What glucose monitoring methods are you currently using?