D-dimer blood test (quantitative)
This test measures the level of D-dimer, a protein fragment produced when blood clots break down. It helps assess whether you may have a blood clot or clotting disorder.
["D-dimer helps rule out blood clots or clotting risks in some conditions."]
Key facts at a glance
- LOINC
- 71427-9
- Short code
- D Dimer Bld IA.rapid-mCnc
- Synonyms
- D Dimer Bld IA.rapid-mCnc
- Category
- coagulation
- Sample
- whole-blood
- Container
- Lavender-top (EDTA)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- ia-rapid
- Specimen volume
- 3 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 4–24 hours
- Order
- routine
Why This Test Is Done
Your healthcare provider may order a D-dimer test to help diagnose or evaluate conditions such as deep vein thrombosis (blood clots in veins), pulmonary embolism (blockage in the lungs), or other clotting disorders. It can also be used to check if a clot has resolved after treatment.
How the Test Works
A small blood sample is taken from a vein, usually in your arm. The sample is sent to a lab where it is analyzed using a sensitive immunoassay method to detect D-dimer levels. The test measures the concentration of D-dimer in your blood.
What to Expect Before the Test
No special preparation is usually needed. You may be asked to fast for a few hours before the test, but this depends on the clinic or lab’s instructions. Wear comfortable clothing and plan to stay for the blood draw.
What to Expect During the Test
The blood draw is quick and typically painless. You may feel a slight pinch or sting, but most people tolerate it well. A healthcare provider will apply a small bandage afterward to the site.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
D-Dimer
Frequently asked questions
A high D-dimer level often suggests recent clot formation, which can indicate conditions like deep vein thrombosis or pulmonary embolism. However, a low or normal level does not definitively rule out these conditions, so further testing may still be needed. Always discuss results with your healthcare provider.
A positive D-dimer result may raise suspicion for conditions like blood clots, but it can also be elevated in other situations, such as pregnancy, heart failure, or certain infections. Your provider will consider the full clinical picture.
How long does it take to get results from a D-dimer test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy