An 18-month-old girl is brought to the physician by her parents because they are concerned that she has not begun to walk. She has been exclusively breast-fed since birth. She is at the 60th percentile for length and the 80th percentile for weight. She speaks in 2-word phrases. Her social skills are appropriate for age. Examination shows no abnormalities except for widening of the wrists. Which of the following serum findings is most likely to be increased?
1α-hydroxylase-mediated substrate turnover
Alkaline phosphatase activity
Calcium
Phosphorus
Uncongugated bilirubin
Alkaline phosphatase activity
Calcium
Phosphorus
Uncongugated bilirubin
