The Wells score is the most commonly used clinical prediction rule for assessing the probability of deep vein thrombosis (DVT). It includes key clinical criteria such as active cancer, recent immobilization, localized tenderness, and previous DVT, which collectively help stratify patients into low, moderate, or high risk categories. This scoring system guides further diagnostic testing and management, improving accuracy and efficiency in DVT diagnosis. Other options like APGAR, Glasgow Coma Scale, and Child-Pugh score assess different clinical conditions unrelated to DVT.

Reference: Harrison's Principles of Internal Medicine, J. Larry Jameson, 20th Edition.