How is D-dimer used in evaluating suspected pulmonary embolism?

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Multiple Choice

How is D-dimer used in evaluating suspected pulmonary embolism?

D-dimer is a very sensitive marker of clot breakdown, used to help decide whether to pursue imaging in suspected pulmonary embolism. In patients with low pretest probability, a negative D-dimer effectively rules out PE, so further imaging can often be avoided. If the D-dimer is positive, it does not confirm PE by itself because many conditions can raise D-dimer, so imaging—typically CT pulmonary angiography—is needed to make the diagnosis. This test is not the primary diagnostic test for PE; its value lies in ruling out the condition when the clinical likelihood is low. In patients with high pretest probability, a positive or even negative D-dimer does not reliably exclude PE, and imaging should be pursued based on clinical judgment.

D-dimer is a very sensitive marker of clot breakdown, used to help decide whether to pursue imaging in suspected pulmonary embolism. In patients with low pretest probability, a negative D-dimer effectively rules out PE, so further imaging can often be avoided. If the D-dimer is positive, it does not confirm PE by itself because many conditions can raise D-dimer, so imaging—typically CT pulmonary angiography—is needed to make the diagnosis.

This test is not the primary diagnostic test for PE; its value lies in ruling out the condition when the clinical likelihood is low. In patients with high pretest probability, a positive or even negative D-dimer does not reliably exclude PE, and imaging should be pursued based on clinical judgment.

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