Normal bilirubin levels vary significantly depending on age. While generally less than 1 mg/dL (milligram per deciliter) for adults, newborn levels can be much higher.
Bilirubin Levels by Age Group:
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Newborns: Normal bilirubin levels in newborns can be surprisingly high, reaching as high as 12 mg/dL. The acceptable range depends on the age of the newborn; for instance, levels above 10 mg/dL might be a cause for concern within the first 24 hours, while levels above 15 mg/dL might be concerning between 24-48 hours. Factors like the type of bilirubin (conjugated or unconjugated) and the presence of other risk factors influence the clinical significance of the levels. (Sources: Medscape, WebMD, American Pregnancy Association, HealthyChildren.org)
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Children and Adults (under 18): For children and adolescents under 18 years old, a normal total bilirubin level is generally considered to be less than or equal to 1 mg/dL. (Source: Provided reference material)
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Adults (over 18 years): In adults over 18, a normal total bilirubin level is typically up to 1.2 mg/dL. (Source: Provided reference material) Other sources suggest a slightly lower range of 0.3-1.0 mg/dL. (Source: Medscape) These differences can result from variations in laboratory methods and definitions of normal ranges.
Important Note: These values represent general guidelines. Individual variations occur, and a doctor should interpret bilirubin levels in context with a patient’s overall health, symptoms, and other lab results. Factors like gender and underlying health conditions may influence the interpretation of bilirubin levels. (Source: University of Rochester Medical Center)
Conjugated (direct) bilirubin levels are typically much lower than total bilirubin levels. Normal levels are usually less than 0.3 mg/dL regardless of age. (Source: Provided reference material)
This information should not substitute for professional medical advice. Always consult a healthcare professional for any concerns regarding your bilirubin levels. They can accurately assess your individual situation and provide appropriate guidance.
