When someone says it went from “45% to 6%,” they may be using the wrong term or referring to a specific lab number. Common possibilities:
In adults, total bilirubin is commonly about
0.1 to 1.2 mg/dL, and yellowing often becomes noticeable above roughly
2 mg/dL, though interpretation depends on age and the direct/indirect bilirubin fractions.
MedlinePlus explains bilirubin testing.
If there is worsening yellowing, fever, severe abdominal pain, confusion, vomiting, pale stools, dark urine, or jaundice in a newborn, seek medical care promptly.