ABSTRACT
The diagnosis of deep venous thrombosis [DVT] may be challenging due to the inaccuracy of clinical assessment and diversity of diagnostic tests. On one hand, missed diagnosis may result in life-threatening conditions. On the other hand, unnecessary treatment may lead to serious complications. As a result of an initiative of the Ministry of Health of the Kingdom of Saudi Arabia [KSA], an expert panel led by the Saudi Association for Venous Thrombo-Embolism [SAVTE; a subsidiary of the Saudi Thoracic Society] with the methodological support of the McMaster University Working Group, produced this clinical practice guideline to assist healthcare providers in evidence-based clinical decision-making for the diagnosis of a suspected first DVT of the lower extremity. Twenty-four questions were identified and corresponding recommendations were made following the Grading of Recommendations, Assessment, Development and Evaluation [GRADE] approach. These recommendations included assessing the clinical probability of DVT using Wells criteria before requesting any test and undergoing a sequential diagnostic evaluation, mainly using highly sensitive D-dimer by enzyme-linked immunosorbent assay [ELISA] and compression ultrasound. Although venography is the reference standard test for the diagnosis of DVT, its use was not recommended