All of the following are normal peripheral blood RBC findings at birth in a full-term infant except:
a. Nucleated RBCs
b. Mean cell volume (MCV) less than 90 fL
c. Reticulocytosis of 5%
d. Hemoglobin of 20.2 g/dL
ANS: B
An MCV of 90 fL in a newborn is abnormal and cause for a thalassemia/iron deficiency work-up. The mean MCV in a full-term newborn is 109 fL; an MCV less than 94 fL is cause for evaluation for a-thalassemia or iron deficiency. All the other results given are normal for a full-term newborn.
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