<qa>  What is the name of the study that is eligible for Consecutive patients with UEConsecutive patients with clinically suspected upper extremity deep vein thrombosis UEDVT are potentially eligible for the study. Patients will be categorized as likely or unlikely to have UEDVT based on a clinical decision rule CDR. Patients unlikely for UEDVT based on the CDR and with normal D-dimer levels will not receive anticoagulant treatment and will be followed-up for 3 months. All patients with a likely CDR or patients with an unlikely CDR combined with elevated D-dimer levels will undergo ultrasonography. In case of an indeterminate ultrasonography result, ultrasonography testing will be repeated 3-5 days later. The same applies for patients with a negative ultrasound and the combination of a high probability and elevated D-dimer levels. Anticoagulants will be withheld in all patients for whom UEDVT will be excluded by the initial diagnostic work-up. 