A newborn is being assessed during the first 24 hours after birth. The nurse notes that the baby has a heart rate of 150 beats per minute (bpm), a respiratory rate of 40 breaths per minute, and a temperature of 97.9°F (36.6°C). The nurse also observes that the newborn is exhibiting signs of jaundice with a total bilirubin level of _____ mg/dL during the first 24 hours.