A nurse is caring for a 7-year-old child who has a fever, tachycardia, and low oxygen saturation. The nurse reviews the child's laboratory results and notes the following:

- WBC count 15,000/mm^3^ (normal range: 5,000 to 10,000/mm^3^)
- Hgb 8 g/dL (normal range: 10 to 15.5 g/dL)
- Hct 32% (normal range: 32% to 44%)

The nurse should suspect that the child has which of the following conditions?

Choice A reason: Leukemia is not a probable condition, as it is a cancer of the white blood cells that causes abnormal proliferation and accumulation of immature or dysfunctional white blood cells. The child has a high WBC count, which can indicate leukemia, but not necessarily. The child does not have other signs of leukemia, such as bleeding, bruising, bone pain, or lymphadenopathy.

Choice B reason: Sickle cell anemia is a possible condition, as it is an inherited disorder that affects the shape and function of the red blood cells, causing them to become sickle-shaped and rigid. The child has a low Hgb and Hct, which can indicate anemia, and a fever, tachycardia, and low oxygen saturation, which can indicate a sickle cell crisis. A sickle cell crisis is a condition where the sickle-shaped red blood cells block the blood flow and cause tissue ischemia and inflammation.

Choice C reason: Hemophilia is not a likely condition, as it is an inherited disorder that affects the clotting factors, causing impaired blood clotting and increased risk of bleeding. The child has a low Hgb and Hct, which can indicate anemia, but not necessarily hemophilia. The child does not have other signs of hemophilia, such as bleeding, bruising, hemarthrosis, or hematuria.

Choice D reason: Iron deficiency anemia is not a definite condition, as it is a type of anemia that occurs when the body does not have enough iron to produce hemoglobin, the protein that carries oxygen in the blood. The child has a low Hgb and Hct, which can indicate iron deficiency anemia, but not necessarily. The child does not have other signs of iron deficiency anemia, such as pallor, fatigue, weakness, or pica.

Choice A reason: This is not a correct instruction for the nurse to include in the teaching. The Pavlik harness is a device that holds the infant's hips in a flexed and abducted position to allow the femoral head to fit into the acetabulum. The harness should not be removed by the parents, as this may interfere with the treatment and cause complications. The nurse should instruct the parents to sponge bathe the infant while wearing the harness.

Choice B reason: This is not a correct instruction for the nurse to include in the teaching. The length of the straps of the Pavlik harness should not be adjusted by the parents, as this may affect the alignment and stability of the infant's hips. The nurse should instruct the parents to bring the infant to the provider's office regularly for check-ups and adjustments of the harness.

Choice C reason: This is not a correct instruction for the nurse to include in the teaching. Massaging the infant's skin under the straps of the Pavlik harness may cause irritation, friction, or pressure on the skin, which may lead to skin breakdown or infection. The nurse should instruct the parents to keep the infant's skin clean and dry, and to check for any signs of redness, swelling, or drainage.

Choice D reason: This is a correct instruction for the nurse to include in the teaching. Placing the diaper under the straps of the Pavlik harness prevents the diaper from interfering with the position and function of the harness. The nurse should instruct the parents to change the diaper frequently and to avoid using bulky or cloth diapers.