title: Bilirubin pigments in the first meconium of newborn infants.
abstract: OBJECTIVE
  To determine the pattern of excretion of total bilirubin IXa and IXb in the first meconium of newborn infants.
  
  
  METHODS
  First two newborns of varying gestational age were selected every week through random sampling from the neonatal unit. Of the 41 newborn infants selected 8 expired before meconium passage, hence the results are from 33 newborns. Meconium was collected and stored at -20 degrees C, protected by aluminium foil. Samples were defrosted, vortex mixed with equal amount of dimethyl-sulfoxide, centrifuged, and analyzed by HPLC.
  
  
  RESULTS
  Unconjugated Bilirubin-IXalpha and -IXbeta were identified and quantitative estimation of Bilirubin-IXa done. Bilirubin-IXb was greater than 50% of the total, in the first meconium of the newborn. Amount of bilirubin excreted in meconium was 29.2 - 90.8 mg [0.051 - 0.155 mmol] per sample of meconium passed. Amount was 9.7 mg/ Kg of body weight in term newborn and 12 mg/kg in preterm.
  
  
  CONCLUSIONS
  The amount of bilirubin -IXb decreases and bilirubin-IXa increases with increasing gestational age. Newborns with birth asphyxia (BA) had significantly greater quantity of bilirubin in meconium, compared to infants without BA.
authors.affiliation: Department of Pediatrics, Sindh Institute of Urology and Transplantation, Karachi.
authors.forename: Sina
authors.initials: S
authors.lastname: Aziz
authors.forename: Shazia
authors.initials: S
authors.lastname: Anjum
authors.forename: Atta Ur
authors.initials: AU
authors.lastname: Rehman
authors.forename: Syed
authors.initials: S
authors.lastname: Ata-ur-Rehman
authors.forename: Durre Samin
authors.initials: DS
authors.lastname: Akram
authors.forename: Syed Ali Anwar
authors.initials: SA
authors.lastname: Naqvi
authors.forename: Syed Adibul Hasan
authors.initials: SA
authors.lastname: Rizvi
mesh_terms: D001647:Bile Acids and Salts; D001654:Bile Pigments / Q000032:analysis*; D001663:Bilirubin / Q000032:analysis / Q000378:metabolism*; D015415:Biomarkers; D002851:Chromatography, High Pressure Liquid; D005243:Feces / Q000737:chemistry*; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn / Q000378:metabolism*; D007234:Infant, Premature / Q000378:metabolism; D008470:Meconium / Q000737:chemistry / Q000378:metabolism*
chemical_list: D001647:Bile Acids and Salts; D001654:Bile Pigments; D015415:Biomarkers; D001663:Bilirubin