A digoxin test checks how much digoxin you have in your blood. Digoxin is a type of medicine called a cardiac glycoside. It is used to treat certain heart problems.
How the Test is Performed
How to Prepare for the Test
Ask your health care provider whether you should take your usual medicines before the test.
How the Test will Feel
When the needle is inserted to draw blood, some people feel moderate pain. Others feel only a prick or stinging. Afterward, there may be some throbbing where the needle was inserted.
Why the Test is Performed
The main purpose of this test is to determine the best dosage of digoxin and prevent side effects.
It is important to monitor the level of digitalis medicines such as digoxin. That is because the difference between a safe treatment level and a harmful level is small.
In general, normal values range from 0.5 to 1.9 nanograms per milliliter of blood. But the right level for some people may vary depending on the situation.
The examples above are common measurements for results of these tests. Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your doctor about the meaning of your specific test results.
What Abnormal Results Mean
Abnormal results may mean you are getting too little or too much digoxin.
A very high value could mean that you have or are likely to develop a digoxin overdose (toxicity).
Risks associated with having blood drawn are slight but may include:
- Excessive bleeding
- Fainting or feeling lightheaded
- Hematoma (blood accumulating under the skin)
- Infection (a slight risk any time the skin is broken)
Heart failure - digoxin test
Mann DL. Management of patients with heart failure with reduced ejection fraction. In: Mann DL, Zipes DP, Libby P, Bonow RO, Braunwald E, eds. Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine. 10th ed. Philadelphia, PA: Elsevier Saunders; 2015:chap 25.
Munger MA, Radwanski PB, Van Tassel BW. Digitalis. In: Vincent JL, Abraham E, Moore FA, Kochanek PM, Fink MP, eds. Textbook of Critical Care. 6th ed. Philadelphia, PA: Elsevier Saunders; 2011:chap 177.
Pincus MR, Abraham NZ Jr. Toxicology and therapeutic drug monitoring. In: McPherson RA, Pincus MR, eds. Clinical Diagnosis and Management by Laboratory Methods. 22nd ed. Philadelphia, PA: Elsevier Saunders; 2011:chap 23.
Review Date 5/5/2016
Updated by: Michael A. Chen, MD, PhD, Associate Professor of Medicine, Division of Cardiology, Harborview Medical Center, University of Washington Medical School, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.