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Comparison of bilirubin production in Japanese and Caucasian infants
A F Fischer1, H Nakamura, Y Uetani
1Stanford University School of Medicine, Department of Pediatrics, California 94305.
Insights
Japanese infants show higher bilirubin production than Caucasian infants, indicated by elevated serum carboxyhemoglobin (HbCOc) and total bilirubin levels. This difference may stem from environmental or genetic factors.
Area of Science:
- Neonatal Medicine
- Pediatric Gastroenterology
- Biochemistry
Background:
- Bilirubin is a byproduct of heme breakdown.
- Elevated bilirubin can cause neonatal jaundice.
- Factors influencing bilirubin production require further investigation.
Purpose of the Study:
- To compare bilirubin production in normal term Japanese and Caucasian infants.
- To investigate potential ethnic differences in bilirubin metabolism.
Main Methods:
- Serum carboxyhemoglobin (HbCOc) levels were measured as an index of bilirubin production.
- Serum total bilirubin levels were quantified.
- Infants with hemolysis or other known causes of increased bilirubin production were excluded.
Main Results:
- Mean HbCOc was significantly higher in Japanese infants (0.69% sat) compared to Caucasian infants (0.58% sat).
- Mean serum total bilirubin was significantly higher in Japanese infants (11.1 mg/dl) versus Caucasian infants (8.0 mg/dl).
Conclusions:
- Japanese infants exhibit higher bilirubin production compared to Caucasian infants.
- Environmental and/or genetic factors may contribute to these observed differences in bilirubin levels.
Abstract:
Bilirubin production, as indexed by serum carboxyhemoglobin (HbCOc), was studied in a group of normal term Japanese infants and Caucasian controls during the second to third day of life. Stringent entry criteria were employed in order to eliminate infants with hemolysis or other known causes of increased bilirubin production. The mean HbCOc of the Japanese infants (0.69 +/- 0.15% sat) was significantly higher than that of the Caucasian infant (0.58 +/- 0.17% sat). The serum total bilirubin was also significantly higher in Japanese infants (11.1 +/- 3.0 mg/dl versus 8.0 +/- 2.2 mg/dl). This difference may be attributable to environmental and/or genetic factors.