Good to knowOne result rarely tells the whole story. Your provider looks at your results together with your symptoms, exam, and other tests.
What the test is
The sample should be drawn at least 6 to 8 hours after your last dose.
Why it's done
- Starting or changing digoxin
- Kidney changes or new interacting medicines
- Nausea, vision changes, or rhythm problems
Getting ready and what happens
- Draw before your next dose, at least 6 to 8 hours after the last one.
How the test is done
- A health worker cleans the skin, puts a band around your arm, and draws blood from a vein with a small needle. It takes a few minutes.
What the results mean
| Result | Typical range for adults |
|---|---|
| Usual target | About 0.5 to 0.9 ng/mL for heart failure (your provider sets your target) |
Normal ranges vary from lab to lab and can differ by age, sex, and pregnancy. Your report lists your lab's own range next to each result. A result a little outside the range is often not a problem.
High
Raises toxicity risk, especially with low potassium.
When a result needs quick action
Call 911A slow, fast, or irregular heartbeat or fainting
Questions to ask your provider
- What do my results mean for me?
- Do I need to repeat this test or have other tests?
Risks
A blood draw is very safe. You may have slight pain or a small bruise where the needle went in.
Related conditions
Related medicines
Related tests
Sources
Last updated 2026-11-13.