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Small erythrocytes (mean corpuscular volume less than 80 mu-3 by the Coulter Model S) were found in 222 (2.75%) of 8,086 consecutive patients admitted to a large suburban general hospital. Forty-five (20.3%) of these 222 patients had laboratory findings consistent with thalassemia. Seventy-six (31.2%) were found to be iron deficient. Patients whose hemoglobin values were below 9.0 Gm. per 100 ml. were more likely to be iron deficient. The hemoglobin A2 values were significantly lower in iron-deficient than in non-iron-deficient patients. Although the mean corpuscular volume is much lower and the erythrocyte count is higher in thalassemia than in iron deficiency, hematologic values obtainable from the Counlter S (such as MCV, erythrocyte count, and hemoglobin) alone are not valuable in differentiating thalassemia from iron deficiency.

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