Which of the following is NOT a risk factor for DVT?

The answer is based on understanding the established risk factors associated with deep vein thrombosis (DVT). Prolonged bed rest, surgical procedures, and obesity are all well-known factors that can contribute to DVT.

Prolonged bed rest can lead to decreased venous return and stasis of blood in the lower limbs, increasing the likelihood of thrombus formation. Surgical procedures, particularly those involving the hips, knees, or pelvis, are associated with increased risks of DVT due to both physical inactivity during recovery and potential damage to blood vessels during surgery. Obesity adds additional strain on the venous return system, and increased adipose tissue can lead to inflammation and changes in coagulation profile, further raising the risk for thrombus development.

In contrast, immune disorders do not have a direct causal relationship with the mechanisms of DVT in the same clear way as the other options. While certain immune disorders may affect the body’s inflammatory response or lead to individual variations in coagulation, they are not typically categorized as primary risk factors for DVT in the same manner as prolonged bed rest, surgical procedures, and obesity. Thus, among the choices presented, immune disorders are not a definitive risk factor for the development of DVT.