Ketones (Beta-Hydroxybutyrate) — mmol/L to mg/dL

In short To convert blood ketones from mmol/L to mg/dL, multiply by 10.4105 — so one mmol/L is 10.4105 mg/dL, and one mg/dL is 0.0960569 mmol/L. 5 mg/dL is 0.5 mmol/L; 15 mg/dL is 1.4 mmol/L; 30 mg/dL is 2.9 mmol/L. The factor comes from the molar mass, because beta-hydroxybutyrate has a molar mass of 104.11 g/mol; that is why it differs for every analyte and why a single "lab unit converter" factor does not exist. Home blood-ketone meters report mmol/L almost everywhere, including in the United States, while a hospital lab in the US may report the same analyte in mg/dL — so this is one of the few conversions people need between their own meter and their own lab report in the same country. The factor is close to 10, so mg/dL divided by 10 is a workable approximation. This converts units. It does not interpret results, does not compare your value against a reference interval, and is not a substitute for the clinician who ordered the test — reference intervals differ between laboratories, methods and populations.