- Soma
- Lab unit converter
- µg/dL to µmol/L
µg/dL to µmol/L
There is no single µg/dL to µmol/L factor. µg/dL counts the mass of a substance, µmol/L the number of its molecules, so the factor depends on the substance’s molar mass. Here are the 2 lab tests Soma converts in these units.
Tests and factors
| Test | Units | US → SI | SI → US | Molar mass |
|---|---|---|---|---|
| Iron | µg/dL ⇄ µmol/L | × 0.17907 | × 5.5845 | 55.845 g/mol |
| DHEA-S (DHEA sulfate) | µg/dL ⇄ µmol/L | × 0.027137 | × 36.85 | 368.5 g/mol |
The molar masses are the ones the Soma app converts with; each links to its compound on PubChem (U.S. National Library of Medicine). HbA1c uses the IFCC–NGSP master equation instead of a molar mass. Urea nitrogen counts the two nitrogen atoms of urea; phosphate is measured as phosphorus. Prolactin and insulin have no molar mass in these units: each uses the factor of the international standard its tests are calibrated to. ALT and AST count enzyme activity: 1 µkat/L is 60 U/L by definition. Mention of a source doesn’t mean it endorses Soma.
µmol/L = µg/dL ÷ 5.5845 · molar mass 55.845 g/mol
Iron: formula and common values →This converter changes units only. It doesn’t tell you whether a number is in or out of any range: that depends on the range printed by your own lab, and on your doctor. Soma does not diagnose and is not medical advice.
Questions
Why is there no single µg/dL to µmol/L factor?
Going from mass to molecules needs the mass of one mole of the substance, and every substance has its own. So each test has its own factor: Iron: divide µg/dL by 5.5845; DHEA-S: divide µg/dL by 36.85.
How do I convert µg/dL to µmol/L?
Find your test in the table and multiply by its factor; to go back, multiply by the other one. For example, 100 µg/dL of iron is 17.9 µmol/L.
By unit pair
Soma converts straight from the PDF
Share a lab report to Soma, and it reads every row on your phone and converts the units for you, so a Quest result in mg/dL and a Synlab result in mmol/L sit on one chart, each against its own lab’s range. No account, nothing uploaded.