Final answer:
A child with Tetralogy of Fallot is expected to have increased hemoglobin levels due to the body's response to hypoxemia caused by the congenital heart defect.
Step-by-step explanation:
The student asked which laboratory value a nurse should expect to find in a child with Tetralogy of Fallot. The correct answer is A. Increased hemoglobin levels. Tetralogy of Fallot is a congenital heart defect that can lead to hypoxemia (low oxygen levels in the blood),which can cause the body to produce more red blood cells in an attempt to carry more oxygen, resulting in a condition known as secondary polycythemia. Consequently, this would be reflected as increased hemoglobin levels in lab tests.