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The History of eAG

Long-term blood sugar testing traces its origins back to 1968, when researcher Samuel Rahbar first described elevated levels of glycated hemoglobin, a form of ordinary hemoglobin with sugar molecules chemically attached to it permanently, in patients living with diabetes, an observation that eventually became the modern HbA1c test used routinely worldwide in clinics and hospitals today. For decades afterward, doctors reported HbA1c only as a plain percentage, a figure that many patients found genuinely difficult to relate meaningfully to the everyday mg/dL numbers already displayed on their own home glucose meters each and every single day of monitoring. That communication gap was finally closed in 2008, when researcher David Nathan led a large international study called ADAG, which carefully and mathematically calculated exactly how HbA1c percentages correspond to a real, everyday average glucose value, creating the eAG figure now used routinely alongside HbA1c in clinics everywhere around the world today.

What eAG Actually Is

eAG isn't a separate substance measured from a fresh blood sample at all — it's simply HbA1c mathematically translated into the same familiar mg/dL units a glucose meter already displays to a patient every single day of their entire life and routine. Because HbA1c reflects the percentage of hemoglobin that has picked up sugar over the roughly three-month lifespan of a typical red blood cell circulating throughout the entire body continuously, eAG effectively communicates that very same three-month rolling average blood sugar level, just expressed in more immediately intuitive, everyday terms patients already understand and recognize well from their own daily glucose monitoring routine and habits over time.

How eAG Is Measured

eAG requires no separate blood draw or additional laboratory test of its own to obtain at all, ever — it's calculated directly from an already-measured HbA1c result using the specific formula the ADAG study established: multiplying the HbA1c percentage by 28.7 and then subtracting 46.7 to arrive at the estimated average glucose value expressed in familiar mg/dL units. HbA1c itself is typically measured using high-performance liquid chromatography or a specialized immunoassay, both established, well-validated methods used in laboratories everywhere around the entire world, with eAG simply layered on top afterward as an automatic, easy-to-understand mathematical conversion for every single patient tested.

Scientists Behind the Science

Samuel Rahbar's 1968 discovery of elevated glycated hemoglobin in diabetic patients provided the essential biochemical foundation that the entire modern HbA1c test, and eventually eAG itself, was later built directly upon over the following several decades of dedicated, painstaking research. David Nathan's 2008 ADAG study represented the critical missing link decades later, translating a somewhat abstract laboratory percentage into a practical, immediately relatable number that patients could genuinely understand and act on in their own daily lives and routines. Together, their combined work, separated by exactly forty full years of steady, incremental scientific progress, transformed long-term diabetes monitoring from an obscure laboratory measurement into a clear, everyday tool that patients now actively use to track and manage their own personal health and overall well-being consistently over time.