A nurse is reviewing the transcutaneous bilirubin measurement of a newborn who is 48 hours old and has physiologic jaundice.

The measurement is 16 mg/dL.

Which of the following actions should the nurse take?

This is because phototherapy can cause dehydration and increase insensible water loss, so covering the genitalia can prevent excessive fluid loss and maintain thermoregulation.

Some possible explanations for the other choices are:

• Choice A is wrong because monitoring skin temperature every hour is not enough to prevent hyperthermia or hypothermia during phototherapy.The skin temperature should be monitored continuously or at least every 15 minutes.

• Choice C is wrong because repositioning newborn every 4 hours is not frequent enough to prevent pressure ulcers, skin breakdown, or eye damage from the light source.The newborn should be repositioned at least every 2 hours.

• Choice D is wrong because encouraging parent-infant interaction as tolerated is not a specific intervention for phototherapy.

While parent-infant interaction is important for bonding and development, it should not interfere with the effectiveness of phototherapy.The newborn should be exposed to the light as much as possible, except for feeding and diaper changes.

Normal ranges for serum bilirubin levels vary depending on the age, gestational age, and risk factors of the newborn.Generally, the levels should be below 5 mg/dL for term infants and below 7 mg/dL for preterm infants by the fifth day of life.

All of the above factors increase the risk of hyperbilirubinemia in this newborn.Hyperbilirubinemia is a condition of high levels of bilirubin in the blood that can cause jaundice and brain damage.

Choice A is wrong because prematurity is a risk factor for hyperbilirubinemia, especially in babies born before 38 weeks of gestation.Premature babies have immature livers that are less able to process bilirubin and eliminate it from the body.

Choice B is wrong because breastfeeding is a risk factor for hyperbilirubinemia, particularly in some breast-fed babies who do not get enough milk or calories.Breastfeeding can also cause increased enterohepatic circulation of bilirubin, which means that bilirubin is reabsorbed from the intestines into the bloodstream instead of being excreted in the stool.

Choice C is wrong because Asian ethnicity is a risk factor for hyperbilirubinemia, as some Asian populations have higher rates of glucose-6-phosphate dehydrogenase deficiency, a genetic condition that causes red blood cells to break down more easily and release more bilirubin.Asian infants may also have lower levels of uridine diphosphate glucuronosyltransferase, an enzyme that helps convert bilirubin into a form that can be excreted by the liver.

Normal ranges for bilirubin levels vary depending on the age, weight, and health status of the newborn.Generally, bilirubin levels peak between the third and seventh day after birth and then decline gradually.The AAP recommends using a nomogram based on the infant’s age in hours and serum bilirubin level to determine the risk of severe hyperbilirubinemia and the need for treatment.Treatment options include phototherapy and exchange transfusion.