When the Smear Speaks First: Early Recognition of Thrombotic Microangiopathy in the Absence of Confirmatory Testing

Thrombotic thrombocytopenic purpura (TTP) is a life-threatening thrombotic microangiopathy requiring rapid recognition and prompt treatment. We present the case of a 44-year-old female who was admitted with symptomatic anemia and evolving cytopenias. Laboratory evaluation demonstrated hemolytic anemia with marked reticulocytosis, thrombocytopenia, elevated lactate dehydrogenase, low haptoglobin, and indirect hyperbilirubinemia. Peripheral smear revealed schistocytes, supporting microangiopathic hemolytic anemia. Coagulation studies were largely unremarkable, and direct antiglobulin testing was negative, excluding disseminated intravascular coagulation and autoimmune hemolysis. Extensive imaging, including computed tomography of the brain, chest imaging, echocardiography, and ultrasonography, did not identify an alternative etiology. Given the high clinical suspicion for TTP, empiric plasma exchange therapy was initiated prior to the availability of confirmatory ADAMTS13 testing. The patient demonstrated progressive improvement in platelet count and hemolysis markers with treatment, supporting the diagnosis. This case underscores the importance of early clinical recognition of TTP based on laboratory patterns and peripheral smear findings. Delaying treatment for confirmatory testing may result in significant morbidity and mortality. Prompt initiation of therapy guided by clinical judgment remains essential in suspected cases.