Digoxin ng/mL → nmol/L
Convert digoxin from ng/mL to nmol/L
Sources last checked: 2026-11-03
Digoxin ng/mL → nmol/L
Convert digoxin from ng/mL to nmol/L
Converts units only; reference ranges depend on the laboratory, the assay and the patient.
What is the Digoxin ng/mL → nmol/L?
Serum digoxin is reported in ng/mL (identical to µg/L) by most laboratories, while some laboratories in countries that apply SI units strictly, and part of the pharmacology literature, use nmol/L. This converter multiplies by 1.281, the factor that follows from the molar mass of digoxin (780.9 g/mol).
When to use it
- Comparing a digoxin level in ng/mL with a guideline, study or poison-centre advice given in nmol/L
- Documenting therapeutic drug monitoring for a patient transferred between health systems
- Calculations for digoxin-specific antibody fragments that require a concentration in a particular unit
- Pharmacology exam questions on therapeutic drug monitoring
When not to use it
- Digitoxin, which is widely used in German-speaking countries, has a different molar mass and different target concentrations
- Samples taken before the distribution phase is complete, which overstate the tissue level whatever the unit
- Total digoxin measured by immunoassay after digoxin-specific antibody fragments have been given
How it is calculated
Digoxin (nmol/L) = digoxin (ng/mL) × 1.281
Clinical pearls and limitations
- Converts units only; reference ranges depend on the laboratory, the assay and the patient.
- 1 ng/mL = 1 µg/L = 1.281 nmol/L; conversely 1 nmol/L = 0.7806 ng/mL.
- Sample after the distribution phase and, for routine monitoring, at steady state; an early post-dose sample can look toxic without reflecting myocardial concentration.
- Hypokalaemia, hypomagnesaemia, hypercalcaemia and hypothyroidism increase sensitivity to digoxin, and renal impairment raises the level; a value must be read with electrolytes and kidney function.
- Endogenous digoxin-like immunoreactive substances (e.g. in neonates, pregnancy, renal or liver failure) and some drugs can interfere with immunoassays.
Frequently asked questions
How do I convert digoxin from ng/mL to nmol/L?
Multiply by 1.281. For example, 0.65 ng/mL × 1.281 = 0.83 nmol/L.
Why is the digoxin factor 1.281?
Digoxin has a molar mass of 780.9 g/mol. 1 ng/mL equals 1 µg/L, and 1000 ÷ 780.9 = 1.281 nmol/L.
Is ng/mL the same as µg/L for digoxin?
Yes. 1 ng/mL = 1 µg/L exactly, so a value printed in µg/L can be entered here unchanged as ng/mL.
Can I convert a digitoxin level with this calculator?
No. Digitoxin is a different glycoside with its own molar mass, so this factor does not apply.
Evidence and guidelines
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<p><a href="https://medelix.ai/en/calculators/digoxin-ng-ml-to-nmol-l">Digoxin ng/mL → nmol/L calculator by Medelix</a></p>For healthcare professionals and medical students. These tools support, and do not replace, clinical judgement. Always check results against the original source and your local protocols.