When performing the daily head-to-toe assessment of a 1-day-old newborn, the nurse observes a yellow tint to the skin on the forehead, sternum, and abdomen. Which action should the nurse take?

Measure bilirubin levels using transcutaneous bilirubinometry.

Evaluate cord blood Coomb's test results.

Review maternal medical records for blood type and Rh factor.

Prepare the newborn for phototherapy.