In this large prospective cohort of >1000 patients with suspected DVT, researchers evaluated the efficacy of using the Wells rule vs the Primary Care rule for ruling out DVT. The performance of the rules were similar in ruling out DVT (each missed about 1.5% of DVTs). However, the primary care rule has fewer elements, and does not require “alternative diagnosis at least as likely as DVT” which is required in the Wells rule. A list of both rules can be found at (full text)
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