D-Dimer Test

Does a high D-Dimer confirm a blood clot?

No — D-Dimer is very sensitive but not specific, meaning many things besides blood clots, including surgery, pregnancy, and infection, can raise it. A positive result usually leads to imaging tests to confirm or rule out an actual clot.

Why is a negative D-Dimer result useful?

Because D-Dimer is highly sensitive to clotting activity, a normal result makes conditions like deep vein thrombosis or pulmonary embolism quite unlikely, helping doctors avoid unnecessary further testing in low-risk patients.

Can pregnancy affect D-Dimer levels?

Yes, D-Dimer levels naturally rise during pregnancy, which makes interpreting this test more complex in pregnant patients and often requires additional clinical judgment.