The jaundice value of 258 usually refers to the total bilirubin concentration, which is not serious in healthy full-term infants, but is higher in preterm infants, requiring intervention, and in adults, requiring investigation of the cause of the jaundice and active intervention. It is recommended to consult the attending physician for evaluation and to follow the treatment prescribed by the doctor. Physiologic hyperbilirubinemia, or jaundice, occurs in almost all newborns. In term infants, a total bilirubin concentration of 258 mmol/L does not yet reach the threshold for intervention and is not considered a serious condition. For preterm infants, the severity is related to gestational week; the smaller the gestational week, the lower the total bilirubin threshold for intervention, e.g., in a non-term infant at 32-34 weeks’ gestational week, a bilirubin concentration greater than 170 mmol/L will require phototherapy intervention, and greater than 257 mmol will require blood exchange therapy. For adults, common causes of jaundice include hepatitis, alcoholic liver disease, and biliary obstruction, all of which require aggressive treatment to avoid serious consequences.