Total Bilirubin — µmol/L to mg/dL

In short To convert bilirubin from µmol/L to mg/dL, multiply by 0.0584672 — so one µmol/L is 0.0584672 mg/dL, and one mg/dL is 17.1036 µmol/L. 1.0 mg/dL is 17 µmol/L; 2.0 mg/dL is 34 µmol/L; 3.0 mg/dL is 51 µmol/L. The factor comes from the molar mass, because bilirubin has a molar mass of 584.67 g/mol; that is why it differs for every analyte and why a single "lab unit converter" factor does not exist. The same factor applies to total, direct and indirect bilirubin, since all three measure the same pigment. Newborn jaundice charts are the place this conversion bites hardest: the widely used treatment thresholds are published in mg/dL in the United States and in µmol/L in the UK, so a parent comparing the two sets of guidance is comparing numbers seventeen times apart. 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.