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===American Thoracic Society In Pregnancy<ref>Leung, A et al. An Ofﬁcial American Thoracic Society/Society of Thoracic Radiology Clinical Practice Guideline: Evaluation of Suspected Pulmonary Embolism [http://www.thoracic.org/statements/resources/pvd/evaluation-of-suspected-pulmonary-embolism-in-pregnancy.pdf PDF]</ref>===
*D-dimer is not recommended for excluding PE (weak recommendation, very-low-quality evidence).
*If signs and symptoms of deep venous thrombosis (DVT), first perform bilateral venous compression ultrasound (CUS) of lower extremities, followed by anticoagulation treatment if positive and by further testing if negative (weak recommendation, very-low-quality evidence).
*If no signs and symptoms of DVT, pulmonary vascular imaging should be used over bilateral lower extremity ultrasounds(weak recommendation, very-low-quality evidence).