A cause of thrombocytopenia includes a. A cause of thrombocytopenia includes select one: If the thrombocytopenia lab finding is unexpected and the pt is asymptomatic, what is the first step in your work up? Nov 3, 2020 · investigations are tailored to the presentation and may include: A patient with thrombocytopenia has a decreased number of platelets, and therefore prolonged bleeding will be observed even for minor injuries.