If the CBC reveals severely low platelets, what is the most likely diagnosis?

• A. Thrombocytopenia
• B. Anemia
• C. Leukopenia
• D. Thrombocytosis

Answer: (A)

Platelets are essential for forming clots to stop bleeding. If the CBC shows a severely low platelet count, the most likely diagnosis is thrombocytopenia, a deficiency of platelets that increases bleeding risk. Normal platelets are roughly 150,000 to 450,000 per microliter; when they're well below that, especially severely low, bleeding tendencies become a primary concern. Anemia involves low red blood cells or hemoglobin and causes fatigue or pallor, leukopenia is low white blood cells and raises infection risk, and thrombocytosis means high platelets, not low. So the finding of markedly reduced platelets specifically points to thrombocytopenia.