The nurse is obtaining a health history from parents whose 4-month-old boy has congenital hypothyroidism. What would the nurse most likely assess?

A. Sausage-shaped mass in the upper midabdomen: A sausage-shaped mass is more characteristic of intussusception rather than hypertrophic pyloric stenosis. Intussusception typically presents with intermittent abdominal pain, currant jelly stools, and a palpable tubular mass. Projectile vomiting without bile is not the classic presentation for this finding.

B. Hard, moveable, olive-shaped mass in the right upper quadrant: Hypertrophic pyloric stenosis classically presents with a firm, olive-shaped mass in the right upper quadrant or epigastric area. This mass represents the hypertrophied pyloric muscle and is most often palpated during feeding. Progressive, forceful projectile vomiting is a hallmark feature supporting this finding.

C. Tenderness over the McBurney point in the right lower quadrant: McBurney point tenderness is associated with acute appendicitis, which is rare in infants this young. Appendicitis presents with localized right lower quadrant pain, fever, and guarding rather than projectile vomiting.

D. Abdominal pain in the epigastric or umbilical region: Diffuse or localized abdominal pain is more typical of conditions such as gastroenteritis or early appendicitis. Infants with pyloric stenosis usually appear hungry after vomiting and do not typically demonstrate abdominal pain. The key finding is a palpable mass rather than pain.

A. "Your child will do well after birth once transfusions are administered": This statement focuses on postnatal intervention rather than preventing maternal sensitization during pregnancy, which is the primary purpose of RhoGAM.

B. "RhoGAM kills antibodies you make, so your kid will be protected": RhoGAM does not destroy existing antibodies; it prevents the formation of maternal antibodies against Rh-positive fetal cells. This explanation could mislead the patient.

C. "Your baby may be Rh positive and cause you to make antibodies. These won't affect this baby, but could affect future children if RhoGAM isn't given": RhoGAM prevents maternal sensitization by neutralizing fetal Rh-positive red blood cells before the immune system responds. This explanation clearly communicates the purpose of the medication and the relevance for future pregnancies.

D. "If the baby is Rh negative at birth, he or she will need RhoGAM also": RhoGAM is administered to the mother, not the baby, and is only necessary if the mother is Rh-negative and the fetus is Rh-positive.