ONS Chemotherapy Immunotherapy Certificate Practice Test

Thrombocytopenia refers to a condition characterized by a low platelet count in the blood. Platelets are essential for normal blood clotting and play a critical role in preventing excessive bleeding. When their levels are lower than the normal range, which is typically between 150,000 and 450,000 platelets per microliter of blood, the risk of bleeding increases significantly. This condition can arise from various factors, including bone marrow disorders, certain medications, autoimmune diseases, or infections.

To further understand thrombocytopenia, it's essential to know that high platelet counts or a normal platelet count would not be classified as thrombocytopenia. Additionally, an increased number of red blood cells pertains to a different condition altogether, such as polycythemia, and is unrelated to thrombocytopenia. Therefore, a low platelet count represents the correct definition of thrombocytopenia, highlighting its importance in hematology and patient care.

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