What is considered the most definitive diagnostic test for leukemia?

A. Increased appetite is not an expected finding in a child with iron deficiency anemia. Children with iron deficiency anemia typically experience a reduced appetite or may develop pica (craving non-food substances) rather than an increased appetite.

B. Pallor is a common sign of iron deficiency anemia, as a lack of iron reduces the number of red blood cells and the amount of hemoglobin, leading to pale skin and mucous membranes.

C. Tachycardia is a compensatory response to anemia, as the heart works harder to deliver oxygen to tissues due to a reduced capacity of the blood to carry oxygen.

D. Brittle spoon-shaped nails (koilonychia) are a classic physical finding in iron deficiency anemia, caused by the reduced oxygen delivery to the nails and skin.

A. Urine specific gravity 1.015 is correct. A specific gravity of 1.015 indicates good hydration status and that the child is effectively retaining fluids after oral rehydration therapy. Normal urine specific gravity ranges from 1.010 to 1.020.

B. Respiratory rate 24/min is not directly related to hydration status and does not necessarily indicate that rehydration therapy has been effective. It is a normal rate for a 3-year-old child, but respiratory rate alone isn't an indicator of fluid balance.

C. Heart rate 130/min is elevated for a 3-year-old child and may indicate dehydration or other stressors, suggesting that oral rehydration therapy has not been completely effective. A normal heart rate for this age is typically 80-120 beats per minute.

D. Capillary refill greater than 3 seconds is a sign of dehydration and poor perfusion, indicating that the oral rehydration therapy has not been effective in restoring hydration. Normal capillary refill time is less than 2 seconds.