Absence of D dimers is useful for ruling out:

a. Deep venous thrombosis
b. von Willebrand disease (VWD)
c. Protein C deficiency
d. Factor VII deficiency


ANS: A
The D dimer is a specific marker for thrombosis; when the assay is negative, it is useful for ruling out DVT. (A positive result does not rule in DVT because D dimers are increased in many situations.)

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