Digoxin blood level
Quick answer: This test measures the amount of digoxin, a heart medicine, in your blood. It helps doctors check the dose is safe and effective, and look into symptoms such as nausea or a slow pulse.
- SampleBlood
- TakesAbout 5 minutes
- Before the testYour doctor will tell you when to give the sample; it is usually taken at least 6 hours after your last dose.
How the test is done
- 1Blood is drawn at least six hours after your last dose
- 2You tell the staff when you last took digoxin
- 3Potassium and kidney tests are often checked at the same time
- 4The lab measures the amount of digoxin in your blood
What your results can mean
Reading your report
Results are read with your kidney function and potassium level; do not change your dose without talking to your doctor.
If the result is outside the usual range
A high level can cause nausea, poor appetite, blurred or yellow-tinged vision and heart rhythm problems. A low level can mean the medicine may not be controlling the heart condition as intended.
Who usually has this test
People taking digoxin for heart failure or an irregular heart rhythm, especially older adults or those with kidney problems.
Risks and aftercare
Bruising is possible; continue your medicine as prescribed.
Names and options
Also called: digoxin test, Lanoxin level
Listed by the hospital as
- DIGOXIN, SERUM
Questions about this test
Why must the sample be taken six hours after a dose?
Digoxin takes time to move from the blood into body tissues. Testing too soon can give a falsely high reading.
What are the signs of too much digoxin?
Nausea, vomiting, poor appetite, confusion, seeing yellow or green halos, and a slow or irregular pulse can be signs. Contact your doctor promptly if you notice them.
Can kidney problems affect digoxin levels?
Yes, digoxin is cleared by the kidneys, so poor kidney function can raise levels. This is why kidney tests are often checked too.
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This page explains each test in general terms so you know what to expect. It is not medical advice: your doctor decides which tests you need and what your results mean. Reference ranges differ between laboratories. Updated 4 November 2026.