What is D-dimer Test?
D-dimer test is a diagnostic blood test that measures D-dimer levels, a protein that is produced when blood clots are dissolved in the body. The test is commonly used to rule out or diagnose conditions involving abnormal clotting, such as deep vein thrombosis (DVT), pulmonary embolism (PE) or disseminated intravascular coagulation (DIC). High D-dimer levels indicate active clot formation and breakdown in the body, requiring further investigation.
How is the Test Performed?
A blood sample is drawn from a vein, usually in the arm. The sample is then sent to a laboratory, where it is analyzed using methods such as enzyme-linked immunosorbent assay (ELISA) or latex agglutination to determine the D-dimer concentration. These methods detect the presence and amount of D-dimer in the blood, providing valuable information about clot formation and breakdown in the body.
What are the symptoms that prompt this test?
Your doctor might suggest this test if you have are having cardiovascular related symptoms. Generally the symptoms in adult men and women are the same, while in children there may be some other symptoms. Here are some symptoms that might prompt this test:
Adults
- Swelling
- Sharp pain in chest
- Warmth feeling in the body which is not a fever
- Changes in skin color of leg or arm
- Difficulty breathing or shortness of breath
- Coughing up blood
- Rapid heartbeat
- Pain during breathing
Children
- Unexplained bruising
- Severe leg or arm pain
- Persistent fever without infection
- Difficulty breathing or shortness of breath
What are Normal Ranges for This Test?
Normal ranges of this protein is the same for adults and children. It should be less than 500 ng/mL (nano-grams per milliliter). If the quantity is above this normal range, your doctor might suggest further testing or start medicine. Pregnant women may naturally have higher levels, particularly in the third trimester, which requires careful interpretation by a doctor.
**The above-given reference value is for general guidelines only. Your healthcare provider will give you the correct interpretation of the results. **
What Happens if Test Results Show Abnormal Levels?
Abnormal D-dimer test results indicate increased clotting activity in the body. Elevated levels require further evaluation, such as:
- Imaging tests like ultrasound or CT scans to detect clots
- Comprehensive blood panel tests to check for underlying conditions
- Referral to a hematologist or vascular specialist for advanced care
Your doctor may recommend anticoagulant therapy or other interventions depending on the diagnosis.
