The purpose of this study is to see if a blood test (D-dimer) is as precise as the CT scan
for the detection of clots.
A pulmonary embolism is an obstruction of the blood vessels in your lungs usually due to a
blood clot that travels to the lungs usually from the leg. Research has shown that the
results of a specific blood test (D-dimer) can be used instead of a CT scan to diagnose
clots. D-dimer is a valuable diagnostic marker in either detecting the presence of or
monitoring the progress of blood clots. D-dimer assays have proven to be a beneficial
diagnostic tool in the evaluation of patients with suspected pulmonary embolism (PE).
- All patients evaluated in the urgent care center and determined to need with CT
pulmonary angiogram to rule out pulmonary embolism based on signs and symptoms such
as dyspnea, pleuritic chest pain, tachycardia, and/or pulse oxygen desaturation will
- Inability to obtain CT pulmonary angiogram secondary to lack of IV access, contrast
allergy or lack of consent.
- CT pulmonary angiogram not done with routine protocol for rule out pulmonary
- Less than 21 years of age