A nurse is assessing a 1-year-old toddler and notices a large abdominal mass and pink-tinged urine on the diaper.

Which of the following disorders should the nurse suspect?

Choice A rationale

Hypoglycemia, a condition of low blood glucose (normal range 40-60 mg/dL in neonates), is not prevented by phytonadione (vitamin K). This condition is primarily related to inadequate glucose stores or production, often seen in large or small for gestational age infants or those whose mothers had diabetes. Vitamin K is essential for coagulation factor synthesis, not glucose metabolism regulation.

Choice B rationale

Hyperbilirubinemia, characterized by elevated serum unconjugated bilirubin (jaundice), is not prevented by routine vitamin K administration. This condition results from increased breakdown of fetal red blood cells and the neonate's immature liver function being unable to adequately conjugate and excrete bilirubin. Vitamin K does not directly influence bilirubin processing or excretion pathways.

Choice C rationale

Phytonadione (vitamin K) is administered to neonates to prevent Vitamin K Deficiency Bleeding (VKDB), previously known as hemorrhagic disease of the newborn. Vitamin K is crucial for the liver's synthesis of coagulation factors II, VII, IX, and X. Neonates have low vitamin K stores and insufficient gut flora to produce it, making supplementation necessary to prevent life-threatening bleeding.

Choice D rationale

Polycythemia is an abnormally high concentration of red blood cells (hematocrit > 65.

Choice A rationale

Kernicterus, which is brain damage caused by excessive unconjugated bilirubin deposits, is a severe complication primarily associated with pathologic jaundice, not physiologic jaundice. Physiologic jaundice is common and self-limiting because bilirubin levels usually peak below the critical thresholds needed to breach the blood-brain barrier.

Choice B rationale

Pathologic jaundice is defined by its early onset, appearing within the first 24 hours after birth, which is a key distinguishing feature. This rapid rise in bilirubin often indicates an underlying condition, such as hemolytic disease of the newborn, that requires urgent investigation and treatment to prevent complications.

Choice C rationale

Exchange transfusion is a severe intervention, occasionally used to treat critically high bilirubin levels associated with pathologic jaundice, especially in cases of Rh or ABO incompatibility. Physiologic jaundice is typically treated with non-invasive phototherapy and never requires such an aggressive procedure.

Choice D rationale

Physiologic jaundice is a benign, transient condition that affects most newborns and does not require transfer to the Neonatal Intensive Care Unit (NICU). Treatment, if needed, is usually simple phototherapy, which can often be managed on a regular maternity unit or even at home.