Jane Carter, a 67-year-old retired college faculty member,...

Jane Carter, a 67-year-old retired college faculty member, has a history of TIAs and takes ticlopidine because she cannot tolerate aspirin. She presents for a routine clinic visit. Her complete blood count (CBC) results are as follows: white blood cells 3000 cells/mcL; red blood cells 4.2 to $5.4 \mathrm{million}$ cells/mcL; hemoglobin 12 to $16 \mathrm{~g} / \mathrm{dL}$; hematocrit $42 \%$; platelets $100,000 / \mathrm{mm}^5$.

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Key Concepts

Hematologic Laboratory Testing

This concept involves understanding the complete blood count (CBC) which assesses the different components of blood including white blood cells, red blood cells, hemoglobin, hematocrit, and platelets. It is essential for diagnosing and monitoring conditions that affect the bone marrow or blood composition and for identifying abnormalities such as cytopenias.

Drug-Induced Cytopenias

Some medications can lead to a reduction in blood cell counts, a condition known as cytopenia. Recognizing that certain drugs, particularly some antiplatelet agents, may cause side effects like neutropenia (reduced white blood cell count) and thrombocytopenia (reduced platelet count) is important for timely diagnosis and management of these adverse drug effects.

Antiplatelet Therapy and Associated Risks

Antiplatelet medications are used to prevent blood clots by inhibiting platelet aggregation, thereby reducing the risk of strokes and other thrombotic events. However, such therapies come with potential risks, including hematologic side effects. Balancing the therapeutic benefits against the possible adverse effects is a crucial part of clinical decision-making in patient management.

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