Abstract: Objective To study the D-dimer levels of the patients with pulmonary embolism and analyze its influencing factors. Methods One hundred and eighty patients with pulmonary embolism from 2005 to 2009 were reviewed retrospectively, and the relation among pulmonary embolism and D-dimer were analyzed. Results The positive rate (78.31%) of the samples that used the drug was lower than the positive rate(98.20%) of the samples that had not used the drug. The positive rate (85.14%) of the samples that collected the blood after 24 hours was lower than the positive rate(98.20%) of the samples that collected the blood in 24 hours. Conclusion The results show that the positive rate of the D-dimer is related to the time and drug-use before the samples of obtaining.

Key words: pulmonary embolism, D-dimer, influencing factors