The duration of blue light treatment for jaundice cannot be generalized, but needs to be determined by a combination of the patient’s condition and the results of the phototherapy. Regardless of the patient’s race or the cause of hyperbilirubinemia, phototherapy reduces TB levels and slows the tendency or rate of TB increase in almost all cases of hyperbilirubinemia. Effective phototherapy can reduce TB levels by at least 2-3 mg/dL (34-51 μmol/L) within 4-6 hours. Decreases in TB levels were detectable 2 hours after starting treatment. After 24 hours of phototherapy, patients can effectively reduce their initial TB levels by 25-40%. Phototherapy is typically discontinued in the following situations: infants readmitted to the hospital for phototherapy with TB levels reduced to 12-14 mg/dL (205-239 μmol/L). Infants requiring phototherapy during birth hospitalization with TB levels reduced to or below the level at which phototherapy was initiated. Treatment should be under the supervision of a physician and should not be overly worrisome as you actively cooperate with the physician’s treatment plan.