A full-term weighing 3500g boy presents mildly jaundice with a total serum bilirubin of 205μmol/L(0.12g/L) at 48 hours of age.The baby is born to a 27-year-old primigravida with blood type O at 2 hours after membranes rupture. Breast-feeding has been wellThe most appropriate additional diagnostic studies to evaluate the cause of this infant jaundice are

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• A 2-hour-old full-term newborn infant is noted to be having episodes of cyanosis and apnea，which are worse when he is feeded but are better when he is stimulated and cries.The most important next step to quickly establish the diagnosis is
• A full-term weighing 3500g boy presents mildly jaundice with a total serum bilirubin of 205μmol/L(0.12g/L) at 48 hours of age.The baby is born to a 27-year-old primigravida with blood type O at 2 hours after membranes rupture. Breast-feeding has been wellThe most appropriate additional diagnostic studies to evaluate the cause of this infant jaundice areThe nurse calls to inform you that the infant studies are back.The baby has O-positive blood. His direct serum bilirubin is 3. 4μmol/L(0.002g/L) with a repeat total serum bilirubin of 201 μmol/L(0.12g/L). The white count is 13×10⁹/L with a diff
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