Which of the following is true regarding testing for the diagnosis of vascular disorders?
a. Most do not have abnormal clinical laboratory tests.
b. The platelet count and aggregometry are useful.
c. The prothrombin time (PT) and partial thromboplastin time (PTT) are most useful.
d. Evaluation of von Willebrand factor (VWF) is useful.
ANS: A
Clinical laboratory tests are not available for evaluation and diagnosis of vascular disorders. Ruling out other sources of bleeding disorders often makes the diagnosis. The usual clinical signs are easy bruising and spontaneous bleeding, especially from mucosal surfaces. In that respect they are similar to platelet dysfunction disorders.
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