A 72-year-old woman is admitted to the hospital with an acute illness. Her platelet count is incidentally noted to be 800,000/mL.For the above patient with a blood-count anomaly, select the corresponding clinical situation and/or laboratory finding.

Both acute blood loss and chronic iron deficiency can increase platelets. Hemolytic anemia is associated with both increased reticulocytes and thrombocytosis. Thromboembolic or hemorrhagic phenomena are more common in essential thrombocytosis rather than secondary causes.