Final answer:
A hemoglobin level of 12.5 g/dL (hgb 12.5) should be recognized by the nurse as an indication of anemia in a school-age child experiencing fatigue.
Step-by-step explanation:
The nurse should recognize a hemoglobin level of 12.5 g/dL (hgb 12.5) as an indication of anemia. The normal hemoglobin level for school-age children is 11.5 to 15.5 g/dL, so a hemoglobin level of 12.5 falls within the lower range, suggesting a potential anemia. Anemia is a condition characterized by a deficiency of red blood cells or hemoglobin, which can result in fatigue.