Cholesterol units split the world the same way glucose units do. Multiply mg/dL by 0.0259 for mmol/L, or multiply mmol/L by 38.67 to go back, and any foreign lab report becomes readable.
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Scientific references
Same molecule, different rulers
American lab reports express cholesterol as milligrams per deciliter, while most of Europe, Canada, and Australia use millimoles per liter. The bridge between them runs through the molecular weight of cholesterol, and the practical factors are 0.0259 going toward mmol/L and 38.67 returning toward mg/dL. A total cholesterol of 200 mg/dL equals 5.2 mmol/L, the desirable line in both conventions.
Numbers worth memorizing
A handful of landmarks cover most situations. An LDL of 100 mg/dL is 2.6 mmol/L, the optimal target quoted in both American and European guidance. Total cholesterol of 240 mg/dL is 6.2 mmol/L, the traditional high line. HDL of 60 mg/dL is 1.55 mmol/L, the protective threshold. With those pairs in memory, most international reports decode themselves at a glance.
Triglycerides use a different bridge
Do not reuse the cholesterol factor for triglycerides. Their molecular weight differs, and the correct conversion divides mg/dL by 88.5 to get mmol/L. Mixing the two factors produces confident nonsense, a mistake common enough that some lab software now flags unit fields in bold.
Why the split persists
The mass unit tradition in the United States reflects clinical habit more than logic, while the molar convention aligns with how chemists think about molecules. Both describe identical biology, and every major guideline publishes cut points in both units. The converter above simply saves you the multiplication on the days the other system shows up in your mailbox.