Update: NMR Score Detects Insulin Resistance Before Blood Sugar Rises

Full analysis

What's new since we last covered this: LP-IR score validation showing early insulin resistance detection ahead of glucose elevation.

The LP-IR score — a composite of six lipoprotein size and concentration measurements derived from a single NMR blood test — can identify insulin resistance years before blood glucose becomes elevated. This matters because by the time fasting glucose crosses the diabetes threshold of 126 mg/dL, roughly half of the insulin-producing beta cells in the pancreas have already lost function. Jim Otvos draws a direct parallel to cardiovascular disease: just as elevated LDL is the causal driver of atherosclerosis that should be treated before a heart attack, insulin resistance is the causal driver of type 2 diabetes that should be treated before glucose rises. An unpublished analysis from the Diabetes Prevention Program — the landmark study that established lifestyle intervention and metformin as tools to prevent diabetes — showed that the LP-IR score was significantly reduced by lifestyle changes, and that the degree of reduction predicted who went on to develop diabetes.

An expanded version called the Diabetes Risk Index (DRI) adds three branched-chain amino acids (leucine, isoleucine, and valine) to the LP-IR score for further accuracy. Both tests are currently available through Labcorp. Otvos notes that a standard oral glucose tolerance test can catch this earlier signal too, but the two-hour procedure has fallen out of routine use, making the NMR-derived score a practical alternative.