Review of the peripheral blood smear for a patient confirms the presence of thrombocytopenia. Red cells are normochromic and normocytic with no increase in polychromatophilic erythrocytes. A few teardrop cells are present. White blood cells show a left shift but no toxic granulation or Döhle bodies. No circulating blasts are seen. The patient denies any history of alcohol abuse. The test for HIV is negative, and he is not on any medications. Vitamin B12 and folic acid levels are normal. Is a bone marrow evaluation necessary for this patient? Why or why not?
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