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
It's very good at ruling clots out but not at proving them. Many things raise it, including pregnancy, surgery, infection, cancer, and older age.
Why it's done
- Leg swelling or pain that could be a DVT
- Shortness of breath or chest pain that could be a lung clot
Getting ready and what happens
- No special preparation is needed.
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 |
|---|---|
| Normal | Below about 0.5 mcg/mL FEU (500 ng/mL); cutoffs may be adjusted for age |
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.
Normal
Makes a clot unlikely when the chance was low or moderate to begin with.
High
Doesn't confirm a clot. An ultrasound or CT scan is needed.
When a result needs quick action
Call 911Sudden shortness of breath, chest pain, or coughing blood
Call your provider todayOne swollen, painful, warm leg
Questions to ask your provider
- What do my results mean for me?
- Do I need to repeat this test or have other tests?
- Do I need an ultrasound or CT scan?
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.