Absence of D dimers is useful for ruling out:

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D-dimer is a small protein fragment that is present in the blood after a blood clot is degraded. Therefore, the absence of D-dimer in the blood can be used to rule out the presence of deep venous thrombosis (DVT). However, the absence of D-dimer cannot rule out the other three options (von Willebrand disease, Protein C deficiency, Factor VII deficiency) as none of them directly involve the formation or degradation of blood clots.

Absence of D Dimers Is Useful for Ruling Out